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

void randy(int array[] ){
int i = 0  , d = 0;
		for(i = 1 ; i <= 23 ; i++){
			
			array[i] =  1 + (rand() % 365 ); 
		}
	}

int compare (const void * a, const void * b)
{
return ( *(int*)a - *(int*)b );
}



int find (int arr[]){
 int d = 0;
 	
 	for(d = 1  ;d <=23 ; d++ ){
 		
		 if(arr[d] == 	 arr[d + 1]){
		 	return 1;
		 }
	 }
	
	return 0;
}

int main(void){
	 double count_birthday = 0;
	int  people[24];
  
	srand(time(NULL));
	
	int c = 0 ;
	long double ip = 0;
	
	
	
	while(ip++ <= 1000000 ){
		

		randy(people);
		qsort (people, 25, sizeof(int), compare);
		if(find (people) == 1 ){
			count_birthday++;
		}

	}

printf("%.2lf", 	count_birthday  / 10000  );
return 0;
}