#include
using namespace std;
#include
int main()
{

vector<int>v1;
int N, D;
int may_empty, real_empty;
float e;
cin >> N;
cin >> e;
cin >> D;
may_empty = real_empty = 0;
for (int i = 1; i <= N; i++) {
	int j = 1;
	int data = 0;//記錄當前使用者用電量不足e的天數
	int num_days;//當前使用者天數
	cin >> num_days;
	while (j <= num_days) {
		float elec;
		cin >> elec;
		if (elec < e)
			data++;
		j++;
	}
	if (data > num_days / 2) {
		if (num_days > D) {
			real_empty++;  //確定空置加一
		}
		else {
			may_empty++;  //僅可能空置加一
		}
	}
}
printf("%.1f", (float)(may_empty * 100) / N);
cout << "% ";
printf("%.1f", (float)(real_empty * 100) / N);
cout << "%";
return 0;
 

}