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a guest Sep 22nd, 2019 82 Never
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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.     // freopen("in", "r", stdin);
  7.     // freopen("out", "w", stdout);
  8.  
  9.     int a, b;
  10.     while (cin >> a >> b) cout << 2 * a * b << endl;
  11.  
  12.     return 0;
  13. }
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