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