#include<bits/stdc++.h>
using namespace std;
int main(){
int sum=0;
for(int i=100;i>=1;i-=3) sum+=i;
cout<<sum;
}

#include<bits/stdc++.h> using namespace std; int main(){ for(int a=100;a>=1;a-=3){ cout<<a<<" "; } return 0; }

#include<bits/stdc++.h>
using namespace std;
int main(){
    for(int a=100;a>=1;a-=3){
        cout<<a<<" ";
}
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
	cout<<100+97+94+91+88+85+82+79+76+73+70+67+64+61+58+55+52+49+46+43+40+37+34+31+28+25+22+19+16+13+10+7+4+1;
}