#include<bits/stdc++.h>
using namespace std;
int a,b,c;
int main(){
	cin>>a>>b>>c;
	if(a>b) swap(a,b);
	if(a>c) swap(a,c);
	if(b>c) swap(b,c);
	if(b<=a-c+1) cout<<b+c+1;
   	else cout<<2+a+(b-a+c-1)/2; 
	return 0;
}