class Mod
	def initialize(m)
		@MOD = m
	end
	def modPow(x, a)
		return x if a == 1
		return (x * modPow(x, a-1)) % @MOD
		t = modPow(x, a / 2)
		(t * t) % @MOD
	end
	def modInv(x)
		modPow(x, @MOD - 2)
	end
end

P, N = gets.split(" ").map{|s| s.to_i}
A = gets.split(" ").map{|s| s.to_i}
S = gets.strip

ans = A[0]

mod = Mod.new(P)

0.upto(N-2) {|i|
	x = A[i+1]
	case S[i]
	when "+" then
		ans = (ans + x) % P
	when "-" then
		ans = (ans - x) % P
	when "*" then
		ans = (ans * x) % P
	when "/" then
		ans = (ans * mod.modInv(x)) % P
	end
}

puts ans