#include<bits/stdc++.h>
#define IOS ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
using namespace std;
typedef double db;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> pii;
typedef vector<pii> vii;
typedef vector<ll> vi;
typedef vector<string> vs;
typedef vector<char> vc;
const int inf=0x3f;
const int N=1e6+10;
ll ppmax,a,b,c,d,e,f;
int main() {
	int T=1;
//	cin>>T;
	while(T--) {
		int n;
		string s1,s2;
		cin>>n>>s1>>s2;
		int f=-1;
		for(int i=0;i<n;i++){
			if(s1[i]==1 || s2[i]==1)continue;
			if(s1[i]==0 && s2[i]==0){
				f=i;
				break;
			}
		}
		
		if(f==-1){
			int a=s1[n-1]-'0';
			int b=s2[n-1]-'0';
			if(a==1 || b==1)cout<<1;
			else cout<<0;
		}else{
			cout<<0; 
		}
	}
    return 0;
}