#include<bits/stdc++.h> using namespace std; int main() { int a[5]; for (int n = 0; n < 5; n++) { cin >> a[n]; } int sum = 0; for (int i = 0; i < 5; i++) { sum = sum + a[i]; } double b = sum / 5.0; printf("%.2f", b); cout <<endl; return 0; }