import java.util.Scanner;

class Main
{
		public static void main(String arg[])
		{
				Scanner cin = new Scanner(System.in);
				int N = cin.nextInt();
				int M = cin.nextInt();
				int[][] R = new int[N][M];
				int[] last = new int[M];
				int[] deg = new int[N];
				int ans = 0;
			  
				for(int i = 0; i < N; i++) {
						for(int j = 0; j < M; j++) {
								R[i][j] = cin.nextInt();
								if(R[i][j] > R[last[j]][j]) {
										for(int k = last[j]; k < i; k++) {
												if(R[last[j]][j] == R[k][j]) {
														
														deg[k]--;
														if(deg[k] == 0) {
																ans--;
														}
												}
										}
										last[j] = i;
										deg[i]++;
										if(deg[i] == 1) ans++;
								} else if(R[i][j] == R[last[j]][j]) {
										deg[i]++;
										if(deg[i] == 1) ans++;
								}		
						}
						System.out.println(ans);
				}
		}
}