Function main

codes/cpp/Code_3_04_2.cpp:7–18

double Answer = 0.0;

int main() {
	// ����
	cin >> N;
	for (int i = 1; i <= N; i++) cin >> P[i] >> Q[i];

	// �����̌v�Z �� �����̏o��
	for (int i = 1; i <= N; i++) {
		Answer += 1.0 * Q[i] / P[i];
	}
	printf("%.12lf\n", Answer);
	return 0;
}