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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6.     long long n;
  7.     cin >> n;
  8.  
  9.     unsigned x=0;
  10.     for (;n;x++)
  11.         n>>=1;
  12.     cout <<" "<< (1ULL << x) - 1;
  13.  
  14.     return 0;
  15. }
Success #stdin #stdout 0.01s 5464KB
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stdin
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288230376151711743
stdout
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 288230376151711743
https://ideone.com/hXVUJl
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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