#include"bits/stdc++.h"
using namespace std;

int main(){
    size_t sAll=1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+0;
    
    cout<<sAll;

    return 0;

}