题解 | #进制转换#

const numMap = {}

new Array(10).fill(1).forEach((v, i) => numMap[i] = i)
new Array(6).fill(1).forEach((v, i) => numMap[String.fromCharCode(65 + i)] = i+10)


while(line = readline()){
    print(hex2decimal(line))
}


function hex2decimal(str){
    return str.slice(2).split('').reverse().reduce((prev, cur, i) => prev + numMap[cur] * (16 ** i) ,0)
}