#include <stdio.h>

  

// given method that returns 1 to 5 with equal probability

int foo() 

{

    // some code here

}

  

int my_rand()   // returns 1 to 7 with equal probability

{

    int i;

    i = 5*foo() + foo() - 5;

    if (i < 22)

        return i%7 + 1;

    return my_rand();

}

​

// Driver code

int main()

{

    printf ("%d ", my_rand());

    return 0;

}