#include <stdio.h>

int main()
{
    int start;
    int end;
    int step_size;
    
    printf("Count down start?\n");
    scanf("%d",&start);
    printf("Count down end?\n");
    scanf("%d",&end);
    printf("Step size?\n");
    scanf("%d",&step_size);

// Perform count down
    printf("%d", start);
    for (int i = start - step_size; i >= end; i -= step_size)
    {
        printf(", %d", i);
    }
    
    
    
    
    return 0;
}