#include <iostream>
using namespace std;

int main() {
    int i;
    int s = 0;
    float d;
    for(i=0; i < 5; i++){
        s = s + i; 
        cout << s << "\n";
    }
    d = s*1.0/i;
    cout << "i = " << i << " s = " << s << "\n";
    cout << "d = " << d <<  "\n";
	return 0;

}