public class Lab4_1 {
	public static void printArray(int[] tsifri) {
		double geom=1;
		for (int i=0;i<tsifri.length;i+=2) {
			geom*=tsifri[i];
			if (i<tsifri.length&&i>=tsifri.length-1) {
			System.out.println(Math.pow(geom, 2./i));
			break;
			}
		}
	}
	public static void main(String[] args) {
		printArray(new int[]{3, 1, 2, 6, 4, 2});
		printArray(new int[]{2,32,131,-212,0});
		printArray(new int[]{0});
		printArray(new int[]{13,12,11,13});
	}

}