#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void main()
{
	srand(time(NULL));
	int rand1, rand2, yes=0, n=0, boxes[3][2]={{1,1} , {2,2} , {1,2}};  // 1- golden coin;

	while (n<RAND_MAX)
	{
		do
		{
			rand1=rand()%3;
			rand2=rand()%2;
		}
		while (boxes[rand1][rand2]!=1);

		if (rand2==0 && boxes[rand1][1]==1) yes++;
		else if (rand2==1 && boxes[rand1][0]==1) yes++;

		n++;
	}

	printf ("Probability: %lf\n\n\n", yes/(double)n);
}