#include<stdio.h>
long n,m,k,x1,y1,i,j,x2,y2,dist,a[101][101];
int main()
{
    freopen("kdrum.in","r",stdin);
    freopen("kdrum.out","w",stdout);
    scanf("%ld%ld%ld",&n,&m,&k);
    scanf("%ld%ld%ld%ld",&x1,&y1,&x2,&y2);
    for(i=1;i<=n;i++)
                     for(j=1;j<=m;j++)
                                      scanf("%ld",&a[i][j]);
    dist=x2-x1+1+y2-y1;
    printf("%ld",dist);
    return 0;    
}