#include<iostream>
#include<math.h>
using namespace std;

int main(){
    int a, b, c;
    cout << "Nhap canh a=";
    cin >> a;
    cout << "Nhap canh b=";
    cin >> b;
    cout << "Nhap canh b=";
    cin >> c;
    int p = a + b + c;
    cout << "Chu vi tam giac la: " << p << endl;
    double s = sqrt((a + b + c)*(a + b -c)*(b + c - a)*(c + a - b))/4;
    cout << "Dien tich tam giac la: " << s << endl;
    return 0;
}