#include<stdio.h>
int main(){
	long long a,b;
	char m;
	scanf("%lld %c %lld",&a,&m,&b);
	if(m=='+') printf("%lld\nSince %lld+%lld=%lld, the output should be %lld.",a+b,a,b,a+b,a+b);
	else if(m=='-') printf("%lld",a-b);
	return 0;
}