Trouble using for loop with an array as well as reading in values.

For some reason I can't get this program to work.  It has something to do with how I have setup the for loop nested inside that is designed to read in 5 integer values.  After it gets done reading in the 5 values I get a logic error that prints out like this:    

Enter Name: Enter Class:

Instead of just having it like it was the first time it runs through:

Enter Name: (Name entered)
Enter Class: (Class entered)
and so on...

Here is the code for the program so far:

#include <iostream.h>
#include <iomanip.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

char Name[5][20];
char Class[5][20];
char Teacher[5][20];
int      Grades[5];

void main()
{
 
  system("cls");

  cout << "This program creates a sheet of test results for 5 students." << endl << endl;


      for( int i = 0; i < 5; i++ )
      {
            cout << "Enter Name: ";
            cin.getline( Name[i],20 );
            
            cout << "Enter Class: ";
            cin.getline( Class[i],20 );

            cout << "Enter Teacher: ";
            cin.getline( Teacher[i],20 );

            for( int j = 0; j < 5; j++ )
            {
                  cout << "Enter Grade: ";
                  cin >> Grades[j];
            }
      }
 
system("pause");
} // end of main()