#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

void solve()
{
    int n;
    cin >> n;
    string a, b;
    cin >> a >> b;

    for (int i = 0; i < n - 1; ++i)
    {
        if (a[i] == '2' || b[i] == '2')
        {
            cout << 0 << '\n';
            return;
        }
    }

    if (a[n - 1] == '1' || b[n - 1] == '1')
        cout << 1 << '\n';
    else
        cout << 0 << "\n";
}

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