#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> PII;
#define int long long
const int mod = 998244353;
void add(int &x, int y) {
   x += y;
   x = (x % mod + mod) % mod;
}
int mul(int x, int y) {
   return 1ll * x * y % mod;
}
int qmi(int x, int y) {
   int res = 1;
   while (y) {
      if (y & 1) res = mul(res, x);
      x = mul(x, x);
      y >>= 1;
   }
   return res;
}
void solve() {
   int n;
   cin >> n;
   string a, b;
   cin >> a >> b;
   int ok = 0;
   for (int i = 0; i < n; i++) {
      if (a[i] != '1' && b[i] != '1') {
         ok = 3;
         break;
      }
   }
   if (ok == 3) cout << 0 << endl;
   else cout << 1 << endl;
}
signed main() {
   ios::sync_with_stdio(false);
   cin.tie(0);
   cout.tie(0);
   int t = 1;
   while (t--) {
      solve();
   }
}