with open('input.txt', 'r') as InputFile:
         N,a, b, c = InputFile.read().split()
N = int(N);a = int(a);b = int(b);c = int(c);
if a+b ==N or b+c==N or a+c == N:
    value = 2
if a or b or c == N :
    value = 1
if a+b+c == N:
    value = 3
with open('output.txt', 'w') as OutputFile:
   OutputFile.write(str(value))