#include <stdio.h>
int main ()
{
   int m,t,s=0,x;
   scanf("%d%d%d",&m,&t,&s);
   if(s==0) printf("%d",m);
   else if(s<t) printf("%d",m-1);
   else if(s%t==0) {
   	x=m-s/t;
   	printf("%d",x);
   }
    else  {
   	x=m-s/t-1;
   	printf("%d",x);
   }
	return 0;
}