#include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, c, i;     cin >> n >> m;     c = 2 * n;     i = 1;     while (i <= 2 * n) {       if (m > c) {         c++;         cout << c <<    ;       }       cout << i <<    ;       i++;       if (m < i) break;     }     return 0;   }   