var readline = require('readline')
 
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
})
 
rl.on('line', function(line) {
    var n = parseInt(line)
    var ret = callatz(n)
    console.log(ret)
})
 
 
function callatz(n) {
    var step = 0
 
    while (n > 1) {
        if (n % 2 == 0) {
            n /= 2
        } else {
            n = (3 * n + 1) / 2
        }
 
        step += 1
    }
    
    return step
}