#include<stdio.h>

int main()
{   
	float a,b;
	char c;
	scanf("%f %c %f",&a,&c,&b);
	switch (c) {
		case '+':
			printf("=%.2f",a+b);
			break;
		case '-':
			printf("=%.2f",a-b);
			break;
		case '*':
			printf("=%.2f",a*b);
			break;
		case '/':
			printf("=%.2f",a/b);
			break;
		default:
			printf("无效运算符");
			break;
	}
	return 0;
}