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#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    if(n > 10) cout << -1;
    else cout << 2;
}

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包对的

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin >> n;
if(n > 10) cout << -1;
else cout << 2;
}