#include<bits/stdc++.h> using namespace std; int main(){ cout<<5050; return 0; }

#include<bits/stdc++.h> using namespace std; int main() { cout<<"5050"; }

#include<bits/stdc++.h> using namespace std; int main(){ int sum=0; for(int i=1;i<=100;i++){ sum+=i; } cout<<sum; return 0; }

#include<iostream> using namespace std; int main(){ cout<<"5050"; return 0; }

#include<iostream> using namespace std; int main(){ cout<<"5050"; return 0; }