What will be printed out as a result of the follow

What will be printed out as a result of the following program's execution?

#include <iostream>
using namespace std;

int main() {
  cout << 1 << hex << 16;
  return 0;
}

hex changes the base used for integer I/O to hexadecimal.
Other available options:
dec - decimal base format.
oct - octal base format.

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