import java.io.*; public class Main { public static BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out)); public static StreamTokenizer cin = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in))); public static PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out)); public static void main(String[] args) throws Exception { cin.nextToken(); double a = cin.nval; cin.nextToken(); double b = cin.nval; cin.nextToken(); double c = cin.nval; double s = (a + b + c) / 2; double S = Math.sqrt(s * (s - a) * (s - b) * (s - c)); cout.printf("%.3f", S); cout.flush(); } }
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