#include"stdio.h"

#include"string.h"

long f[51][51][51][51];

int main()

{ long i,w,r,i4,j,k,m,n,o,p,max=0;

long a[51][51];

memset(f,0,sizeof(f));

scanf("%ld %ld",&m,&n);

for(i=1;i