import sys,math
a=int(input())
b=int(input())
c=int(input())
print(min(a,c)+min(b,c)-c+1)#include <bits/stdc++.h>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int b,g,n;
cin>>b>>g>>n;
int p=0;
int q=n;
int c=0;
for(int i=0;i<(n+1);i++)
{
if(p<=b && q<=g)
{
c++;
}
p++;
q--;
}
cout<<c<<endl;
return 0;
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