n, x, m = gets.chomp!.split(" ").map(&:to_i)

if x == 0
    puts 0
    exit 0
elsif x == 1
    puts n
    exit 0
end

memo = {}

ans = x
sum = x
memo[ans] = 1

b_i = -1
2.upto(n) do |i|
    ans = (ans ** 2) % m
    sum += ans
    if memo[ans]
        b_i = i - 1
        sum -= ans
        break
    else
        memo[ans] = 1
    end
end

if b_i == -1
    puts sum
else
    # 残回数
    rem = n - memo.length

    j = -1
    found = false
    sub = 0
    memo.each.with_index(0) do |(k, _), i|
        if k == ans
            found = true
            j = i
        end

        if found
            sub += k
        end
    end

    # 1ループ数
    lp = memo.length - j

    sum += ((rem / lp) * sub)
    #pp sum
    rem2 = rem % lp
    #pp rem2
    x = memo.keys
    #pp x
    j.upto(rem2+j-1) do |i|
        sum += x[i]
    end

    puts sum
end
    
