#include<bits/stdc++.h>
#define int long long
#define ll long long
#define endl '\n'
using namespace std;
int n;
string a,b;
int dfs(int d){
	if(d==n-1)return 1;
	if(!(a[d]==1||b[d]==1))
		return 0;
	else return dfs(d+1);
}
void solve(){
	cin>>n>>a>>b;
	cout<<dfs(0)<<endl;
	return ;
}
int T=1;
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
//	cin>>T;
	for(int kase=1;kase<=T;kase++){
		solve();
	}
	return 0;
}