按照题意模拟即可

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b;
    char c;
    cin>>a>>c>>b;
    cout<<"steve has ";
    if(c=='+')cout<<a+b<<(a+b>1?" kuns":" kun");
    else if(c=='-')cout<<a-b<<(a-b>1?" kuns":" kun");
    else if(c=='*')cout<<a*b<<(a*b>1?" kuns":" kun");
    else cout<<a/b<<(a/b>1?" kuns":" kun");
    return 0;
}