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#include <fstream>
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int n,m,i,j,sum,p,a,x,v,s[310][310],M;
int main(){
fin>>n>>m>>x;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++){
fin>>v;
s[i][j]=s[i-1][j]+v;
}
for(i=1;i<=n;i++){
for(j=i;j<=n;j++){
sum=0;
a=1;
for(p=1;p<=m;p++){
sum=sum+(s[j][p]-s[i-1][p]);
while(sum>x && p>=a){
sum=sum-(s[j][a]-s[i-1][a]);
a++;
}
if((j-i+1)*(p-a+1)>M)
M=(j-i+1)*(p-a+1);
}
}
}
fout<<M;
return 0;
}