# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	P, N = getlist()
	A = getlist()
	if N == 1:
		print(A[0])
		return

	S = input()
	val = 0
	if S[0] == "+":
		val = A[0] + A[1]
	elif S[0] == "-":
		val = A[0] - A[1]
	elif S[0] == "*":
		val = A[0] * A[1]
	else:
		val = A[0] * pow(A[1], P - 2, P)

	val %= P
	for i in range(2, N):
		if S[i - 1] == "+":
			val += A[i]
		elif S[i - 1] == "-":
			val -= A[i]
		elif S[i - 1] == "*":
			val *= A[i]
		else:
			val *= pow(A[i], P - 2, P)
		val %= P

	print(val)




if __name__ == '__main__':
	main()