C++

#include<bits/stdc++.h>
using namespace std;
int main(){
    long long a,b;
    char y;
    cin>>a>>b>>y;
    if(y=='+'){
        cout<<a + b;
    }
    else if(y=='-'){
        cout<<a - b;
    }
    else{
        cout<<a * b;
    }
    return 0;
}