func multiply[n: Array, x: i64] : void
    carry := 0
    for i in 0..n->size
        prod : i64 = array.nth(n, i) * x + carry
        array.set(n, i, prod % 10)
        carry = prod / 10
    while carry > 0
        array.push(n, carry % 10)
        carry = carry / 10

func main[] : i64
    n := [1]

    for i in 2..101
        multiply(n, i)

    sum := 0
    for i in 0..n->size
        sum = sum + array.nth(n, i)
    
    io.println_i64(sum)