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#include<stdio.h>

int highest(int m[5][5],int r,int c)
{
	int i,j,max=0;
	for(i=0;i<r;i++)
	{
		for(j=0;j<c;j++)
		{
			if(m[i][j]>max)	
				max=m[i][j];
		}
	}
	return max;
}

void main()
{
	int m[5][5],i,j;
	int r,c,result;
	scanf("%d%d",&r,&c);
	if((r<=5)&&(c<=5))
	{
		for(i=0;i<r;i++)
			for(j=0;j<c;j++)
				scanf("%d",&m[i][j]);
		result=highest(m,r,c);
		printf("%d",result);
	}

}