a = []
N = 2017
k = 0
for i in range(0, N):
a.append(int(input()))
if a%16 < 10:
break
else:
while a>0:
a = a//16
k += 1
if k == 3:
m += a
print(m)
YSA9IFtdCk4gPSAyMDE3CmsgPSAwCmZvciBpIGluIHJhbmdlKDAsIE4pOgogICAgYS5hcHBlbmQoaW50KGlucHV0KCkpKQogICAgaWYgYSUxNiA8IDEwOgogICAgICAgIGJyZWFrIAogICAgZWxzZToKICAgICAgICB3aGlsZSBhPjA6CiAgICAgICAgICAgIGEgPSBhLy8xNgogICAgICAgICAgICBrICs9IDEKICAgICAgICBpZiBrID09IDM6CiAgICAgICAgICAgIG0gKz0gYQpwcmludChtKQ==