#define _CRT_SECURE_NO_WARNINGS

#include <bits/stdc++.h>
#include <random>
using namespace std;

typedef unsigned int uint;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<string> vs;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef map<int, int> mii;
typedef map<string, int> msi;
typedef map<int, string> mis;
typedef pair<int, ii> edge;


#define sc(x)  scanf("%d",&x)
#define scl(x) scanf("%lld",&x)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define mem(arr,val) memset(arr,val,sizeof arr)
#define sz(v) (int)v.size()
#define rsz(v) v.resize
#define clr(v) v.clear()
#define rev(v) reverse(all(v))
#define lop(i,end) for(int i=0; i<end; i++)
#define rlop(i,start) for(int i=start-1; i>=0; i--)
#define loop(i,start,end) for(int i=start; i<end; i++)
#define rloop(i,start,end) for(int i=start-1; i>=end; i--)
#define PB push_back
#define pb pop_back
#define mP make_pair
#define f first
#define s second

const ll OO = (ll)(4e18) + 9;
const int MOD = (int)(1e9) + 7;
const int oo = 2147483647;
const double EPS = 1e-8;
const double PI = acos(-1.0);

//enum dir { d, r, u, l , dr, ur, dl, ul };
int dx[] = { 1, 0, -1, 0, 1, -1, 1, -1 };
int dy[] = { 0, 1, 0, -1, 1, 1, -1, -1 };

string abc = "abcdefghijklmnopqrstuvwxyz";
string vowels = "aeiouy"; //and sometimes "aeiouy"

template<typename X, typename Y> bool ckmin(X& a, Y b) { return a > b ? a = b, true : false; }
template<typename X, typename Y> bool ckmax(X& a, Y b) { return a < b ? a = b, true : false; }

int dcmp(ld d1, ld d2) { return fabs(d1 - d2) <= EPS ? 0 : d1 > d2 ? 1 : -1; } //Compare Double Numbers
ll gcd(ll x, ll y) { return !y ? x : gcd(y, x%y); }
ll lcm(ll a, ll b) { return a * (b / gcd(a, b)); }
//convert index from 2D array to 1D array. (Zero-indexed)
int conv_2_1(int r, int c, int nCol) { return (nCol*r) + c + 1; }
//convert index from 1D array to 2D array. (Zero-indexed)
ii conv_1_2(int n, int nCol) {
	int r = n / nCol, c = n % nCol;
	return ii(r, c);
}

void inter(string s) {
	cout << s << endl;
	fflush(stdout);
}

const int NN = 2e6 + 10;
ll fact[NN];

void init() {
	fact[0] = 1;
	for (int i = 1; i < NN; ++i) fact[i] = (fact[i - 1] * 1LL * i) % MOD;
}

ll nCr(ll n, ll r) {
	auto modInverse = [](ll a) { 
		auto power = [](ll base, ll exp) {
			ll ans = 1;
			base %= MOD;
			while (exp > 0) {
				if (exp & 1) ans = (ans * base) % MOD;
				exp >>= 1;
				base = (base * base) % MOD;
			}
			return ans;
		};
		return power(a, MOD - 2); 
	};
	return (fact[n] * modInverse(fact[r] * 1LL * fact[n - r])) % MOD;
}



int main()
{
#ifndef ONLINE_JUDGE

#else
	//freopen("pyramid.in", "r", stdin);
#endif
	//freopen("in.txt", "r", stdin);
	//freopen("out.txt", "w", stdout);
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n, m; ll k;
	cin >> n >> m >> k;
	vll a(n), b(m);
	ll sa = 0, sb = 0;
	lop(i, n) cin >> a[i], sa += a[i];
	lop(j, m) cin >> b[j];
	int j = 0, ans = 0;
	while (j < m and sa + b[j] <= k) sa += b[j++];
	if (sa <= k) ans = max(ans, n + j);
	for (int i = n - 1; i >= 0; i--) {
		sa -= a[i];
		if (sa <= k) {
			while (j < m and sa + b[j] <= k) sa += b[j++];
			ans = max(ans, i + j);
		}
	}
	cout << ans << endl;


	return 0;
}


Measured memory_bytes: 6328