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#include <bits/stdc++.h>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
int n,m,k,x,a[301][301],v[301],ans=0;
int main()
{
f>>n>>m>>k;
for(int i=1;i<=n;i++ ){
for(int j=1;j<=m;j++){
f>>x;
a[i][j]=a[i-1][j]+x;
}
}
for(int up=1;up<=n;up++){
for(int low=up;low<=n;low++){
for(int j=1;j<=m;j++){
v[j]=a[low][j]-a[up-1][j];
}
int st=1,s=0;
for(int dr=1;dr<=m;dr++){
s+=v[dr];
while(st<=dr&&s>k){
s-=v[st];
st++;
}
if(st<=dr)ans=max(ans,(low-up+1)*(dr-st+1));
}
}
}
g<<ans;
return 0;
}