#include<stdio.h>
#define max(a,b) (a>b?a:b)

FILE *fin=fopen("teren.in","r"),
    *fout=fopen("teren.out","w");

int N,M,T[305][305],S[305][305],X;

int main(){
    fscanf(fin,"%d %d %d",&N,&M,&X);
    for(int i=1;i<=N;i++)
        for(int j=1;j<=M;j++){
            fscanf(fin,"%d",&T[i][j]);
            S[i][j]=S[i-1][j]+T[i][j];
        }

    int rez=0;
    for(int i=1;i<=N;i++)
        for(int j=i;j<=N;j++){
            int st=1,suma=0,dr;
            for(dr=st;dr<=M;dr++){
                suma+=S[j][dr]-S[i-1][dr];
                while(st<=dr && suma >X){
                    suma-=S[j][st]-S[i-1][st];
                    ++st;
                }
                if(st<=dr)
                    rez=max(rez,(j-i+1)*(dr-st+1));
            }
        }

    fprintf(fout,"%d\n",rez);
    fclose(fin);
    fclose(fout);
    return 0;

}