#include <stdio.h>

int main() {
    int n,h,m;
    int k=0;
    scanf("%d %d %d",&n,&h,&m);
    if(m%h==0)
	{
           k=n-(m/h);
    }
    else
    k=n-(m/h)-1;
    printf("%d",k);
    return 0;

}