import java.util.Scanner;

public class Exam22 {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
//		input 3*4 numbers and store into 2D
//		array A
		Scanner sc = new Scanner(System.in);
		            // rowsize colsize
		int[][] A = new int[3][4];
		for (int r=0; r<3; r++) {
			for (int c=0; c<4; c++) {
				A[r][c] = sc.nextInt();
			}
		}

		int max = Integer.MIN_VALUE;
		for (int r=0; r<3; r++) {
			for (int c=0; c<4; c++) {
				if (max<A[r][c]) {
					max = A[r][c];
				}
			}
		}
		System.out.println(max);
//		find out the biggest number inside array A
		//input 3*2 numbers and store into 2D array B
		//output col first backward
		//output row second backward

	}
}