"use strict"
const create = () => {
    const input = require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n");
    const res = {
        "list": input, "index": 0, "max": input.length,
        "hasNext": function() {return this.index < this.max},
        "next": function() { if (!this.hasNext()) {throw "ArrayIndexOutOfBoundsException";}else{return this.list[this.index++];}}
    };
    return res;
}
const o = create();
const next = () => o.next()
const nextInt = () => parseInt(o.next())
const nextStrArray = () => o.next().split(" ")
const nextIntArray = () => o.next().split(" ").map(el => parseInt(el))
const nextCharArray = () => o.next().split("")
const hasNext = () => o.hasNext()
const myout = (...x) => console.log(...x)
const Main = () => {
    let [N,M,K] = nextIntArray()
    K = BigInt(K)
    let a = next().split(" ").map(el => BigInt(el))
    let b = next().split(" ").map(el => BigInt(el))

    let tmp = 0n
    let sumA = []
    for(let i = 0 ; i<a.length;i++){
        tmp += a[i]
        sumA.push(tmp)
    }
    tmp = 0n
    let sumB = []
    for(let i = 0 ; i<b.length;i++){
        tmp += b[i]
        sumB.push(tmp)
    }
    let pat = [0]
    for(let i = 0; i<a.length || sumA[i] < K; i++){
        for(let j = 0; j<b.length || sumB[j] < K; j++){
            if(sumA[i] + sumB[j] > K) break
            if(sumA[i] + sumB[j] <= K){
                pat.push(i+j+2)
            }  
        }
    }
    pat.sort((a,b) => b-a)
    console.log(pat[0])
}
Main()
