/*
	Birthday matching problem: 
		Compute a theoretical value

*/

#include <stdlib.h>
#include <stdio.h> /* for srand48(), drand48() */

int n = 50; /*  number of peoples */

int main (int argc, char *argv[] )
{

	int i;
	double p = 1.0;

	for (i=0; i<n; i++) {
		p = p*(double)(365 - i) / 365.0 ;
	}

	printf("%.8lf\n", 1.0 - p );

	return 0;
}