#include <stdio.h>

int main()
{

    double inc = 0, mph = 0, fps = 0;

    printf("Input increment from 0 to 80: \n");
    scanf("%lf", &inc);

    printf("mph to fps. \n");

    while (mph <= 80)
    {
        fps = mph * 5280.0/3600;
        mph += inc;
        if (mph <= 80)
        {
            printf("%5.0f %5.1f \n", mph,fps);
        }
        if (inc == 0) {
            inc += 1;
        }
    }
    return 0;
}