#include <stdio.h>
int main(void)
{
    int  i, n;
    for (i=1; i<=5; i++)
    {
        printf("Please enter n:");
        scanf("%d", &n);
        if (n < 0)    break;
        printf("n = %d\n", n);
    }
    printf("Program is over!\n");
    return 0;
}