#include <bits/stdc++.h>

using namespace std;

float dienTichHCN(float x, float y) {
	return x*y;
}

int tongSoChan(int n) {
	int tong = 0;
	for (int i = 1; i <= n; i++) {
		if (i % 2 == 0 && i % 3 == 0) {
			tong += i;
		}
	}
	return tong;
}

float hamF1(float x, int n) {
	float ketqua = 2016 * pow(x, n);
	for (int i = 1; i <= n; i++) {
		ketqua += pow(x, n) / pow(3, n);
	}
	return ketqua;
}

float hamF2(float x, int n) {
	float ketqua;
	if (n > 10) ketqua = 2016 * x;
	else {
		ketqua = exp(x);
		for (int i = 1; i <= n; i++) {
			ketqua += i;
		}
	}
	return ketqua;
}

int main() {
	float x, y;
	int n;
	cout<<"Nhap x: "; cin>>x;
	cout<<"Nhap y: "; cin>>y;
	cout<<"Nhap n: "; cin>>n;
	cout<<"Dien tich HCN canh x, y la: "<<dienTichHCN(x, y)<<endl;
	cout<<"Tong so chan chia het cho 3 tren doan [1,n] la: "<<tongSoChan(n)<<endl;
	cout<<"Ham F1: "<<hamF1(x, n)<<endl;
	cout<<"Ham F2: "<<hamF2(x, n)<<endl;
	return 0;
}