Submission #59880

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Source Code Expand

#include <iostream>
#include <iomanip>
#include <sstream>
#include <vector>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <string>
#include <algorithm>
#include <cmath>

#define rep(i,n) for(int i=0;i<(n);i++)

using namespace std;

int main() {
    int n,m,dango = 0;
    cin >> n >> m;
    rep(i,n) {
        dango += (i + 1) * (i + 1);
    }
    cout << dango % m << endl;
    return 0;
}

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