#include <stdio.h>
#include <cs50.h>
#include <math.h>

int main(void)


{
    float n;
    do
    {
        n = get_float("Change owed:");
    }
    while(n < 0);

    int x;
    x=round(n*100);


    int coin=0 ;
    while (x>=25)
    {
        x=x-25;
        coin++;
    }
    while (x>=10)
    {
        x=x-10;
        coin++;
    }
    while (x>=5)
    {
        x=x-5;
        coin++;
    }
    while (x>=1)
    {
        x=x-1;
        coin++;
    }
    printf("I have used %i coins\n", coin);

}