import math
 
print '''Это программа калькулятор.
Для сложения, вычитания, умножения, деления используются команды (+),(-),(*),(/) соответсвенно.
Для вычисления квадратного корня используется комманда (`).
Для прибавления, вычитания, умножения, деления на корень квадратный испльзуются комманды (+`) (-`) (*`) (\`).
Для вычисления косинуса используется комманда (").
Для прибавления, вычитания, умножения, деления на косинус используются команды (+") (-") (*") (\") соответсвенно.'''
 
a=float(raw_input('Введите число: '))
 
cmd = (raw_input('>>'));
 
 
while True:
       if cmd=='+': 
               b=float(raw_input('>>')); 
               a=a+b; 
               print a; 
               cmd = (raw_input('>>')); 
 
       elif cmd=='+`': 
               b=float(raw_input('>>')); 
               b=math.sqrt(b)
               a=a+b; 
               print a; 
               cmd = (raw_input('>>')); 
 
       elif cmd=='+"': 
               b=float(raw_input('>>')); 
               b=math.radians(b)
               b=math.cos(b)
               a=a+b; 
               print a; 
               cmd = (raw_input('>>')); 
 
       elif cmd=='-': 
               b=float(raw_input('>>')); 
               a=a-b; 
               print a; 
               cmd = (raw_input('>>')); 
 
       elif cmd=='-`': 
               b=float(raw_input('>>')); 
               b=math.sqrt(b)
               a=a-b; 
               print a; 
               cmd = (raw_input('>>'));
 
       elif cmd=='-"': 
               b=float(raw_input('>>')); 
               b=math.radians(b)
               b=math.cos(b)
               a=a-b; 
               print a; 
               cmd = (raw_input('>>'));
 
       elif cmd=='*': 
               b=float(raw_input('>>')); 
               a=a*b; 
               print a; 
               cmd = (raw_input('>>')); 
 
       elif cmd=='*`': 
               b=float(raw_input('>>')); 
               b=math.sqrt(b)
               a=a*b; 
               print a; 
               cmd = (raw_input('>>')); 
 
       elif cmd=='*"': 
               b=float(raw_input('>>')); 
               b=math.radians(b)
               b=math.cos(b)
               a=a*b; 
               print a; 
               cmd = (raw_input('>>'));
 
       elif cmd=='/': 
               b=float(raw_input('>>'));
                      if b = 0:    
                          print 'На ноль делить нельзя'
                      else:
                          a=a/b; 
                          print a;
                          cmd = (raw_input('>>'));
 
       elif cmd=='/`': 
               b=float(raw_input('>>'));
               b=math.sqrt(b)
               a=a/b; 
               print a;
               cmd = (raw_input('>>'));
 
       elif cmd=='/"': 
               b=float(raw_input('>>')); 
               b=math.radians(b)
               b=math.cos(b)
               a=a/b; 
               print a; 
               cmd = (raw_input('>>'));
 
       elif cmd=='`': 
               a=math.sqrt(a);
               print a;
               cmd = (raw_input('>>'));
 
       elif cmd=='"': 
               a=math.radians(a);
               a=math.cos(a);
               print a;
               cmd = (raw_input('>>'));
 
 
 
 

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