#include <iostream>

using namespace std;

int main( )
{
    int mark1, mark2, mark3,;
    float average;

    //Input the three marks
    cout << "Enter the values of the tree marks" << endl;
    cin >> mark1 >> mark2 >> mark3;

    //Calculate the sum and average
    average = float(mark1 + mark2 + mark3) / 3;
    cout << "The average is " << average << endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}