#include <iostream>

using namespace std;

int main()
{
  int grades[5];
  int average;

 cout << "please enter grade 1: " <<endl;
 cin >> grades[0];
 cout << "enter grade 2: "<<endl;
 cin >> grades[1];
 cout << "please enter grade 3: " <<endl;
 cin >> grades[2];
 cout << "please enter grade 4: "<<endl;
 cin >> grades[3];
 cout << "please enter grade 5: "<<endl;
 cin >> grades[4];

 average = grades[0]+grades[1]+grades[2]+grades[3]+grades[4]/5;


 if (average= < 59){
    cout << "your grade is f" <<endl;
 }

 if (average= > 60 && < 69){
    cout << "your average grade is d" <<endl;
 }
 if (average= > 70 && < 79){
    cout << "your average grade is c"<<endl;
 }
 if (average= > 80 && < 89){
    cout << "your average grade is b"<<endl;
 }

 if (average= > 90 && <100){
    cout << "your average grade was a. grats!"<<endl;
 }
}