1.


/*
 * ACM Contest training
 * Problem: 10200 Prime Time
 * Link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&category=14&problem=1141
 *
 * @author Christoph Göttschkes
 * @version 1.0, 10/19/2010
 *
 * Method : Ad-Hoc
 * Status : Accepted
 * Runtime: 0.316
 */


import java.io.BufferedReader;
import java.io.InputStreamReader;

class Main {

	public static int[] sieve = new int[10001];

	public static void main(String[] args) throws Exception {
		int counter = 0;
		for (int n = 0; n <= 10000; n++)
		{
			if (isPrime(n*n+n+41))
				counter++;
			sieve[n] = counter;
		}
		
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

		String line = reader.readLine();

		while (reader.ready()) {
			calcLine(line);
			line = reader.readLine();
		}
		calcLine(line);
	}

	public static void calcLine(String line) {
		String[] arr = line.split(" ");
		System.out.printf("%.2f\n", calc(Integer.parseInt(arr[0]), Integer.parseInt(arr[1])));
	}

	public static double calc(int a, int b) {
		int counter = sieve[b];
		if (a > 0)
			counter -= sieve[a - 1];
		
		return (((double)(Math.round((((double)counter / (b - a + 1) * 100)*100))))/100);
	}

	public static boolean isPrime(int n) {
		if (n == 2 || n == 3)
			return true;

		if (n < 2 || n % 2 == 0)
			return false;

		if (n < 9)
			return true;

		if (n % 3 == 0)
			return false;

		int r = (int) Math.sqrt(n);
		int f = 5;

		while (f <= r) {
			if (n % f == 0 || n % (f + 2) == 0)
				return false;
			f += 6;
		}
		return true;
	}
}



2. 

/**
 * FWP, Ausgewählte Probleme aus dem ACM Programming Contest, SS10 
 * Problem: 10200 - Prime Time
 * Link: 
 * 
 * @author Barny Porcio
 * @version 1.0, 04/22/2010
 * 
 * Method : precalculation
 * Status : Accepted
 * Runtime: 0.016
 */
#include <iostream>
#include <iomanip>
using namespace std;

int main(){
	cout <<setprecision (2) <<fixed;		
		bool ks[]= 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,1};
		int anfang,ende;
				while(cin>>anfang>>ende){
			int noprimecounter = 0;
			for (int poi = anfang; poi <= ende; poi++){
				noprimecounter += ks[poi];
			}
			double gesamt = ende-anfang+1;
			double percent = (int)(((gesamt-noprimecounter)*10000 / gesamt)+0.5)/100.0;
			cout <<percent<<endl;
		}
			return 0;
}