#include <bits/stdc++.h>   using namespace std;   int main() {     int m, n;     cin >> n >> m;     int c[n];     for (int i = 0; i < n; i++) cin >> c[i];     int a[m];     for (int i = 0; i < m; i++) cin >> a[i];     int d = 0, j = 0;     for (int i = 0; i < n; i++) {       if (a[j] >= c[i]) {         d++;         j++;       }       if (d == m) break;     }     cout << d << endl;   }   