class Main{
public static long func(long n){
if(n <= 100){
return 91;
}
else {
return n - 10;
}
}
public static void main
(String[] args
){ java.
util.
Scanner in
= new java.
util.
Scanner(System.
in); long num = in.nextInt();
System.
out.
println(func
(num
)); }
}
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