import itertools
import operator
import fractions
 
operators = [operator.add, operator.sub, operator.div, operator.mul]
numbers = [1, 5, 6, 7]
 
numbers = [fractions.Fraction(n) for n in numbers]
 
for ops in itertools.product(operators, repeat=3):
    for nums in itertools.permutations(numbers):
 
        value = ops[0](nums[0], nums[1])
        value = ops[1](value, nums[2])
        value = ops[2](value, nums[3])
 
        if value == 21:
            print 21, str(ops), [str(n) for n in nums]
        elif value == 16:
          	print 16, str(ops), [str(n) for n in nums]
        elif value == 11:
          	print 11, str(ops), [str(n) for n in nums]
 

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