#include <bits/stdc++.h>
using namespace std;
#define modulo 998244353
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000000000000000




int main(){
	
	int N;
	cin>>N;
	
	
	
	int A=0,B=0;
	
	for(int i=0;i<N-1;i++){
		int a,b;
		cin>>a>>b;
		A+=a;
		B+=b;
	}
	
	
	if(N==2)cout<<1<<endl;
	else cout<<min(A,B)+1<<endl;
	
    return 0;
}