#include<stdio.h>
int main()
{
	long long int x, y, z;
	scanf("%lld %lld %lld", &x, &y, &z);
	if (y <= z)printf("%lld\n", z - 2);
	else if (x <= z)printf("%lld\n", z - 1);
	else printf("%lld", z);
	return 0;
}