#include <stdio.h>
int main(void){
	long long rest1, rest2, res;
	scanf("%lld%lld%lld",&rest1, &rest2, &res);
	if(res < rest1){
		printf("%lld",res);
	}else if(res < rest2){
		printf("%lld",res - 1);
	}else if(rest2 < res){
		printf("%lld",res - 2);
	}
}