#include <map>

#include <set>

#include <cmath>

#include <ctime>

#include <stack>

#include <queue>

#include <cstdio>

#include <cctype>

#include <bitset>

#include <string>

#include <vector>

#include <cstring>

#include <iostream>

#include <algorithm>

#include <functional>

#define PI acos(-1)

#define eps 1e-8

#define fuck(x) cout<<#x<<" = "<<x<<endl;

#define FIN freopen("input.txt","r",stdin);

#define FOUT freopen("output.txt","w+",stdout);

//#pragma comment(linker, "/STACK:102400000,102400000")

using namespace std;

typedef long long LL;

typedef pair<int, int> PII;

const int maxn = 1e5+;

const int INF = 0x3f3f3f3f;

const int MOD = 1e9+;

LL gcd(LL a,LL b){return b?gcd(b,a%b):a;}

LL lcm(LL a,LL b){return a/gcd(a,b)*b;}

LL powmod(LL a,LL b,LL MOD){LL ans=;while(b){if(b%)ans=ans*a%MOD;a=a*a%MOD;b/=;}return ans;}

double dpow(double a,LL b){double ans=1.0;while(b){if(b%)ans=ans*a;a=a*a;b/=;}return ans;}

LL a[],b[],c[][];

LL sum[][];

LL suma[];

LL sumb[];

int main(){

#ifndef ONLINE_JUDGE

    FIN

#endif

    LL n,m,x;

    cin>>n>>m;

    a[]=b[]=;

    for(int i=;i<=n;i++){

        cin>>a[i];

        a[i]=a[i]+a[i-];

    }

    for(int i=;i<=m;i++){

        cin>>b[i];

        b[i]=b[i]+b[i-];

    }

    cin>>x;

        memset(suma,INF,sizeof(suma));

        memset(sumb,INF,sizeof(sumb));

        for(int i=;i<=n;i++){

            for(int j=;j<=n;j++){

                if(j+i->n) break;

                suma[i]=min(suma[i],a[j+i-]-a[j-]);

            }

        }

        for(int i=;i<=m;i++){

            for(int j=;j<=m;j++){

                if(j+i->m) break;

                sumb[i]=min(sumb[i],b[j+i-]-b[j-]);

            }

        }

        LL ans=;

        for(int i=;i<=n;i++){

            for(int j=;j<=m;j++){

                if((LL)suma[i]*sumb[j]<=x){

                    ans=max(ans,i*j*1LL);

                }

            }

        }

        cout<<ans<<endl;

    // for(int i=1;i<=n;i++){

    //     for(int j=1;j<=m;j++){

    //         cout<<c[i][j]<<" ";

    //     }

    //     cout<<endl;

    // }

}