默念$freopen$的语法，别的没得说

不开long long见祖宗！

#inculde<bits/stdc++.h>
using namespace std;
int main(){
    freopen("plus.in","r",stdin);
    freopen("plus.in","r",stdin);
    long long a,b;
    cin>>a>>b;
    cout<<a+b;
}