#include<stdio.h>
int main()
{   //输入整数n,h,m
    int n,h,m;
   //多组输入，注意输入的整数之间有空格
    while(scanf("%d %d %d",&n,&h,&m)!=EOF)
    {
        if(m%h==0)
            printf("%d\n",n-(m/h));
        else
            printf("%d\n",n-(m/h)-1);
        
}
    return 0;
}