#include <iostream>
using namespace std;
int main() {
	cout<<1+4+7+10+13+16+19+21+24+27+30+43+46+49+52+55+58+61+64+67+70+73+76+79+82+85+88+91+94+97+100;	
	return 0;
} 
/**************************************************************
	Problem: 1053
	User: fuhoubin
	Language: C++
	Result: Wrong Answer
****************************************************************/