#include<stdio.h>
int main()
{
	int a,b,sum;
	char c;
	scanf("%d %d %s",&a,&b,&c);
	
	if(c=='+')
	{
		sum=a+b;
	}
	else if(c=='-')
	{
		sum=a-b;
	}
	else if(c=='*')
	{
		sum=a*b;
	}
	else if(c=='/')
	{
		if(b==0)
			printf("Divided by zero!");
		else{
			sum=a/b;
		}
	}
	if(c!='-'&&c!='+'&&c!='*'&&c!='/')
	{
		printf("Invalid operator!");
	}
	printf("%d",sum);
return 0;
}