Smallest of three integers without comparison operators

#include<stdio.h>

 

int smallest(int x, int y, int z)

{

  int c = 0;

  while ( x && y && z )

  {

      x--;  y--; z--; c++;

  }

  return c;

}

 

int main()

{

   int x = 12, y = 15, z = 5;

   printf("Minimum of 3 numbers is %d", smallest(x, y, z));

   return 0;

}