#include<bits/stdc++.h>
using namespace std;
int main()
{
	cout<<(100+1)*((100-1)/3+1)/2;
return 0;

}
/**************************************************************
	Problem: 1053
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/