let line = readline().split(' ').map(item => Number(item)); let judge = new Array(4).fill(false); let sign = false; const dp = (arr, res, judge) => { if (res === 24) { sign = true; return; } for (let i = 0; i < arr.length; i++) { if (judge[i]) continue; judge[i] = true; dp(arr, res + arr[i], judge); dp(arr, res * arr[i], judge); dp(arr, res - arr[i], judge); dp(arr, res / arr[i], judge); judge[i] = false; } }; dp(line, 0, judge); console.log(sign);