const num_16 = readline() const numMap = { A: 10, B: 11, C: 12, D: 13, E: 14, F: 15 } let res = 0 let num = num_16.slice(2) if(num.length === 1) { res = numMap[num] || num } else { num.split('').reverse().forEach((item, index) => { const cur = numMap[item] || parseInt(item...