5

#define _CRT_SECURE_NO_WARNINGS
#include <vector>
#include <iostream>
#include <string>

using namespace std;

int main()
{
	int n = 3;
	int m = 3;
	int p = 1;
	int a[5][5];
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> a[i][j];
			if (j < i) {
				p = p * a[i][j];
			}
		}
	}
	cout << p;
}