#include<bits/stdc++.h>
using namespace std;
int main()
{
	int j,k;
	char g;
	cin>>j>>k;
	cin>>g;
	if(k==0&&g=='/')
	{
		printf("Divided by zero!\n");
	}
	if(g!='+'&&g!='-'&&g!='*'&&g!='/')
	{
		cout<<"Invalid operator!"<<endl;	
	}
	if(g=='+')
	{
		printf("%d\n",j+k);
	}
	else if(g=='-')
	{
		printf("%d\n",j-k);
	}
	else if(g=='*')
	{
		printf("%d\n",j*k);
	}
	else if(g=='/')
	{
		printf("%d",j/k);
	}
	
	return 0;
} 

RE了，求大佬解答，球球了