#include<bits/stdc++.h>
using namespace std;
int main(){
	int h;
	h=(100+1)*((100-1)/3+1)/2;
	cout<<h<<endl;
    return 0;
}
/**************************************************************
	Problem: 1053
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:3 ms
	Memory:2072 kb
****************************************************************/