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package com.gmail.vhrushyn;

import java.util.Scanner;

public class main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		
		System.out.println("Enter: a");
		double a = sc.nextDouble();
		System.out.println("Enter: b");
		double b = sc.nextDouble();
		System.out.println("Enter: c");
		double c = sc.nextDouble();
		
		double p = (a + b + c) / 2;
		double s = Math.sqrt(p * (p - a) * (p - b) * (p - c));
		
		System.out.println("Area of triangle is " +s);
		
		sc.close();
		
	}

}