a = input().split() a1 = a[0] a2 = a[1] b = input().split() c = input().split() num1 = 0 for i in b: num1 += int(i) num_bao = 0 kilo = 0 for ii in range(1,a2): kilo += c[ii] if not kilo < num1: print(num-bao) break if ii == a2: print('NIE')