#include <bits/stdc++.h>   using namespace std;   const double eps = 1e-8;   const double pi = acos(-1);   const int inf = 0x3f3f3f3f;   const long long INF = 0x3f3f3f3f3f3f3f3f;   const int N = 2e5 + 5;   int n, m;   char a[N], b[N];   void solve() {     scanf( %d , &n);     scanf( %s , a + 1);     scanf( %s , b + 1);     int res = 0;     for (int i = 1; i <= n; ++i) {       if (b[i] ==  1 ) {         if (a[i] ==  0  || a[i - 1] ==  1 )           ++res;         else if (a[i + 1] ==  1 ) {           a[i + 1] =  * ;           ++res;         }       }     }     printf( %d n , res);   }   int main() {     int t;     cin >> t;     while (t--) solve();     return 0;   }   