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