#include "bits/stdc++.h"
#define in std::cin
#define out std::cout
#define rep(i,N) for(LL i=0;i<N;++i)
typedef long long int LL;

int main()
{
	LL X, Y, Z;
	in >> X >> Y >> Z;

	LL ans = Z;
	if (X <= Z) --ans;
	if (Y <= Z) --ans;
	out << ans << std::endl;
}