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#include<stdio.h>

int mmax(int r,int c,int a[][1000])
{
	int i,j,max=0;
	for(i=0;i<r;i++)
	{
		for(j=0;j<c;j++)
		{
			if(a[i][j]>max)
				max=a[i][j];
		}
	}
	return max;
}

void main()
{
	int i,j,r,c,a[1000][1000];
	scanf("%d %d",&r,&c);
	for(i=0;i<r;i++)
	{
		for(j=0;j<c;j++)
			scanf("%d",&a[i][j]);
	}
	printf("%d",mmax(r,c,a));
}