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#include <fstream>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
int a[301][301],i,j,x,st,k,n,m,Max,s,t;
int main()
{f>>n>>m>>x;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
f>>a[i][j];
a[i][j]+=a[i-1][j];}
for(i=1;i<=n;i++){
for(j=i;j<=n;j++){
st=1;s=0;
for(k=1;k<=m;k++){
t=a[j][k]-a[i-1][k];
s+=t;
while(s>x&&st<k){
s-=(a[j][st]-a[i-1][st]);
st++;}
if(s<=x&&(j-i+1)*(k-st+1)>Max)
Max=(j-i+1)*(k-st+1);
}
}
}
g<<Max;
return 0;
}