n = int(input()) x,y,z = map(int,input().split()) a = [] b = [] c = [] abc = [] ab = [] bc = [] ca = [] for i in range(1,n+1): if i%x == 0: a += [i] if i%y == 0: b += [i] if i%z == 0: c += [i] if i%(x*y) == 0: ab += [i] if i%(y*z) == 0: bc += [i] if i%(z*y) == 0: ca += [i] if i%(x*y*z) == 0: abc += [i] print(len(set(aa+bb+cc+abc+ab+bc+ca)))