#include "bits/stdc++.h"
#define rep(i, j) for (int i = 0; i < j; i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;
using ull = unsigned long long;

ll gcd(ll x, ll y);
int fac(ll n, vector<int> num);

const int INF = 1001001001;

//mint�p�̕ϐ� (10��9��)
const int mod = 1000000007;

struct mint {
    ll x; // typedef long long ll;
    mint(ll x = 0) :x((x% mod + mod) % mod) {}
    mint operator-() const { return mint(-x); }
    mint& operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint a) {
        if ((x += mod - a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this; }
    mint operator+(const mint a) const { return mint(*this) += a; }
    mint operator-(const mint a) const { return mint(*this) -= a; }
    mint operator*(const mint a) const { return mint(*this) *= a; }
    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t >> 1);
        a *= a;
        if (t & 1) a *= *this;
        return a;
    }

    // for prime mod
    mint inv() const { return pow(mod - 2); }
    mint& operator/=(const mint a) { return *this *= a.inv(); }
    mint operator/(const mint a) const { return mint(*this) /= a; }
};
istream& operator>>(istream & is, const mint & a) { return is >> a.x; }
ostream& operator<<(ostream & os, const mint & a) { return os << a.x; }

/*int main() {
    int n;
    cin >> n;
    ll ans = 0;

    for (int k = 1; k <= n; k++) {
        ll num = 1;
        if (k != 1) {
            for (int j = 1; j <= sqrt(k); j++) {
                if (k % j == 0) {
                    num++;
                }
            }
        }
        ans += k * num;
    }

    cout << ans << endl;
    return 0;
}*/

int main() {
    ll n, m, k;
    cin >> n >> m >> k;
    vector<int> a(n);
    rep(i, n) cin >> a[i];
    vector<int> b(m);
    rep(i, m) cin >> b[i];

    int ans = 0;
    vector<ll> a_rui(n + 1);
    a_rui[0] = 0;
    for (int i = 0; i < n; i++) {
        a_rui[i + 1] = a_rui[i] + a[i];
    }
    vector<ll> b_rui(m + 1);
    b_rui[0] = 0;
    for (int i = 0; i < m; i++) {
        b_rui[i + 1] = b_rui[i] + b[i];
    }
    for (int i = 0; i <= n; i++) {
        int num = i;
        int ng = m + 1, ok = 0;
        if (a_rui[i] > k) break;
        while (ng - ok > 1) {
            int mid = (ng + ok) / 2;
            if (b_rui[mid] + a_rui[i] > k) {
                ng = mid;
            }
            else {
                ok = mid;
            }
        }

        num += ok;
        ans = max(ans, num);
    }

    cout << ans << endl;
    return 0;
}

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//���[�O���b�h�̌ݏ��@
ll gcd(ll x, ll y) {
    ll num[3];
    num[0] = (x > y) ? x : y;
    num[1] = (x <= y) ? x : y;
    num[2] = num[0] % num[1];

    while (num[2]) {
        num[0] = num[1];
        num[1] = num[2];
        num[2] = num[0] % num[1];
    }

    return num[1];
}

/*�f��������*/
//���색�C�u����
int fac(ll n, vector<int> num) {
    ll kazu = n;
    for (int i = 2; i <= sqrt(n); i++) {
        while (1) {
            if (kazu % i != 0) break;

            kazu /= i;
            num[i]++;
        }
    }
    if (kazu == n && n != 1) return 1;
    int ans = 0;
    if (kazu != 1) ans++;
    for (int i = 2; i <= sqrt(n); i++) {
        for (int j = 1; j <= num[i]; j++) {
            num[i] -= j;
            ans++;
        }
    }
    return ans;
}

Measured memory_bytes: 7964