9. 整数对最小和

const readline = require('readline');
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});

rl.on('line', (input) => {
    let arr1 = input.split(' ').map(Number).slice(1);
    rl.on('line', (input) => {
        let arr2 = input.split(' ').map(Number).slice(1);
        rl.on('line', (input) => {
            let k = parseInt(input);
            const arr = [];
            for(let val1 of arr1) {
                for(let val2 of arr2) {
                    arr.push(val1 + val2);
                }
            }
            arr.sort((a,b)=>a-b);
            let ans = 0;
            for(let i=0; i<k; i++) {
                ans += arr[i];
            }
            console.log(ans);
        });
    });
});