'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', function(inputStdin) {
    inputString += inputStdin;
});

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

function readLine() {
    return inputString[currentLine++];
}



function main() {
    const S = readLine();
    
     try {
        const parsed = parseInt(S, 10)
        if (!/^\d+$/.test(S) || isNaN(parsed)) {
            throw new Error("Bad String");
        }
        console.log(parsed);
    } catch (err) {
        console.log("Bad String");
    }
}