#include<stdio.h>
int main()
{
    int n,h,m;
    int sakura;//已经喝了的酸奶盒数
    while(scanf("%d %d %d",&n,&h,&m)!=EOF)
    {
        if(m%h==0)
        {
            sakura=m/h;
        printf("%d",n-sakura);
        }
        else
            printf("%d",n-m/h-1);
    }
    return 0;
}