#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> PLL;

void solve(){
    ll n;
    cin >> n;
    string s1, s2;
    cin >> s1 >> s2;
    string l1, r1;
    while(l1.size() < n){
        l1 += '0';
        r1 += '0';
    }
    l1[0] = 1;
    r1[0] = 2;
    if(s1[0] != '1' && s2[0] != '1'){
        cout << 0 << '\n';
        return;
    }
    ll x1 = (s1.back() - '0'), y1 = (s2.back() - '0');
    if(x1 == 1 || y1 == 1){
        cout << 1 << '\n';
    }
    else
        cout << 0 << '\n';
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int t = 1;
    //cin >> t;
    while(t --){
        solve();
    }
    return 0;
}