import java.util.HashMap;


public class ScrabbleBet {
	public HashMap<Long, Long> fact;

	public static void main(String args[]) {
		System.out.println(new ScrabbleBet().estimate(2, 2, 1, 50));
		System.out.println(new ScrabbleBet().estimate(2, 2, 2, 50));
	}
	public double estimate(int t, int g, int w, int c) {
		calcFact();

		double p = c/100d;

		long total = (long)Math.pow(g, t);
		long nl = 0l;
		long gm = (long)g;
		for(long i=0; i<w; i++) {
			nl += choose(gm, i) * (1-p)/p;
		}

		p = nl/total;

		return Math.pow(p, t);
	}

	long choose(long n, long m) {
		return (fact.get(n)/fact.get(m))/fact.get(n-m);
	}

	void calcFact() {
		fact = new HashMap<Long, Long>();

		fact.put(0l, 1l);
		for(long i=1; i<21; i++) {
			fact.put(i, fact.get(i-1)*i);
		}
	}
}


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