TrucyeuQuan

#include <bits/stdc++.h>

#define ll long long
#define LIM 1000005
#define X first
#define Y second
#define EL cout<<"\n"

using namespace std;

int n;
int beg = 0;

struct DATHUC
{
	double hs[105];
	int sm[105];
};

DATHUC* Nhap()
{
	DATHUC* F = new DATHUC;

	cin >> n;

	for (int i = 1; i <= n; i++)
		cin >> F->hs[i] >> F->sm[i];

	return F;
}

void xuatdonthuc(double a, int b)
{
	if (a == 1 || a == -1) 
	{
		if (b == 0) 
		{
			cout << a; 
		}
		else if (b == 1)
		{
			cout << "x";
		}
		else 
		{
			cout << "x^" << b; 
		}
	}
	else 
	{
		if (b == 0) 
		{
			cout << a; 
		}
		else if (b == 1)
		{
			cout << a << "x";
		}
		else
		{
			cout << a << "x^" << b;
		}
	}
}

void Xuat(DATHUC B)
{
	int cnt = 0;
	for (int i = 1; i <= n; i++)
		if (B.hs[i] == 0) cnt++;
	if (cnt == n) { cout << 0; return; }

	for (int i = 1; i <= n; i++)
		if (B.hs[i] != 0) { beg = i; break; }

	for (int i = 1; i <= n; i++)
	{
		if (B.hs[i] == 0) continue;

		if (i != beg)
		{
			if (B.hs[i] >= 0) cout << "+";
		}
		
		if (B.hs[i] == -1 && B.sm[i] != 0)
		{
			cout << "-";
		}

		xuatdonthuc(B.hs[i], B.sm[i]);
	}
}

double TinhDaThuc(DATHUC B, double x)
{
	double res = 0;

	for (int i = 1; i <= n; i++) 
	{	
		res += B.hs[i] * pow(x, B.sm[i]);
	}

	return res;
}

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);cout.tie(0);

    DATHUC *B; B = Nhap();
    cout << "Da thuc vua nhap la: "; Xuat(*B);
    double x; cin >> x;
    cout << "\nVoi x=" << x << ", gia tri da thuc la: "
         << setprecision(2) << fixed << TinhDaThuc(*B, x);
    return 0;
}