atm.js

var moneyTypes = [5000, 1000, 500, 100, 50, 30]

var lims = {
    5000: 4,
    1000: 5,
    500: 2,
    100: 5,
    50: 100,
    30: 23
}

function getMoney(amount, limits) {
    const result = {}

    for ( let value of moneyTypes ) {
        result[value] = Math.floor(amount / value)
        amount = amount % value
        limits[value] -= result[value]

        if ( limits[value] < 0 ) {
            amount += Math.abs(limits[value]) * value
            result[value] -= Math.abs(limits[value])
            limits[value] = 0
        }
    }

    if ( amount > 0 ) { throw new Error(`unable to provide requested sum: extra ${amount} RUR`) }

    return {
        res: result,
        limits,
    }
}

console.log(getMoney(21330, lims))