#include <stdio.h>

  

int foo() // given method that returns 0 with 60% probability and 1 with 40%

{

    // some code here

}

 

// returns both 0 and 1 with 50% probability

int my_fun()

{

    int val1 = foo();

    int val2 = foo();

    if (val1 == 0 && val2 == 1)

        return 0;   // Will reach here with 0.24 probability

    if (val1 == 1 && val2 == 0)

        return 1;     // Will reach here with 0.24 probability

    return my_fun();  // will reach here with (1 - 0.24 - 0.24) probability

}

  

int main()

{

    printf ("%d ", my_fun());

    return 0;

}