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#include <bits/stdc++.h>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
int a[301][301];
int main()
{int n,m,i,j,k,lim,x,maxx=0,s,p,q;
f>>n>>m>>x;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
f>>a[i][j];
for(j=1;j<=m;j++)
for(i=1;i<=n;i++)
a[i][j]+=a[i-1][j];
for(i=1;i<=n;i++)
for(j=i;j<=n;j++)
{
s=a[j][1]-a[i-1][1];
p=1;
q=1;
while(p<=m)
{
while(q<=m and s<=x)
{
q++;
s+=a[j][q]-a[i-1][q];
}
if((j-i+1)*(q-p)>maxx)
maxx=(j-i+1)*(q-p);
s-=a[j][p]-a[i-1][p];
p++;
}
}
g<<maxx;
return 0;
}