#include <iostream>

using namespace std;

int main()
{

  int grades[6];


  int i;


  for (i=1;i<=5;i++) {
    cout << "Input grade " << i << ": ";
    cin >> grades[i];
    //..
  } 

  float average = (static_cast<float>(grades[1]+grades[2]+grades[3]+grades[4]+grades[5])/5);

  cout << "The average grade is " << average << endl;

  return 0;
}