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Main.java
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Main.java
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/*
*
* Author : fcbruce <fcbruce8964@gmail.com>
*
* Time : Thu 01 Oct 2015 03:59:00 PM CST
*
*/
import java.util.*;
import java.math.*;
import java.io.*;
public class Main {
InputStream in;
PrintWriter out;
void solve() {
while (true) {
double cows, cars, show;
try {
cows = nextDouble();
cars = nextDouble();
show = nextDouble();
} catch (Exception ex) {
break;
}
double all = cows + cars;
double res = cows / all * cars / (all - show - 1) + cars / all * (cars - 1) / (all - show - 1);
out.printf("%.5f", res);
out.println();
}
}
void run() throws Exception {
in = System.in;
out = new PrintWriter(System.out);
solve();
out.flush();
}
public static void main(String[] args) throws Exception { new Main().run(); }
private byte[] inbuf = new byte[1024];
private int lenbuf = 0, ptrbuf = 0;
private int readByte() {
if (lenbuf == -1) throw new InputMismatchException();
if (ptrbuf >= lenbuf){
ptrbuf = 0;
try { lenbuf = in.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
if (lenbuf <= 0) return -1;
}
return inbuf[ptrbuf++];
}
private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
private int skip() { int b; while ((b = readByte()) != -1 && isSpaceChar(b)); return b; }
private double nextDouble() { return Double.parseDouble(nextString()); }
private char nextChar() {
int b = readByte();
if (b==-1) throw new InputMismatchException();
else return (char)b;
}
private String nextString() {
int b = skip();
if (b == -1) throw new InputMismatchException();
StringBuilder sb = new StringBuilder();
while (!(isSpaceChar(b))) { // when nextLine, (isSpaceChar(b) && b != ' ')
sb.appendCodePoint(b);
b = readByte();
}
return sb.toString();
}
private char[] nextString(int n) {
char[] buf = new char[n];
int b = skip(), p = 0;
while (p < n && !(isSpaceChar(b))) {
buf[p++] = (char)b;
b = readByte();
}
return n == p ? buf : Arrays.copyOf(buf, p);
}
private int[] nextArray(int n) {
int[] a = new int[n];
for (int i = 0;i < n;i++) a[i] = nextInt();
return a;
}
private int nextInt() {
int num = 0, b;
boolean minus = false;
while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
if (b == -1) throw new InputMismatchException();
if (b == '-') {
minus = true;
b = readByte();
}
while (true) {
if (b >= '0' && b <= '9') {
num = num * 10 + (b - '0');
} else {
return minus ? -num : num;
}
b = readByte();
}
}
private long nextLong() {
long num = 0;
int b;
boolean minus = false;
while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
if (b == -1) throw new InputMismatchException();
if (b == '-'){
minus = true;
b = readByte();
}
while (true) {
if (b >= '0' && b <= '9') {
num = num * 10 + (b - '0');
} else {
return minus ? -num : num;
}
b = readByte();
}
}
}