def task():
amin=None
while(True):
str_inp=input()
if str_inp=="." : return amin
a=int(str_inp)
if (amin==None) and (a >0) : amin=a
if (a < amin) and (a > 0) : amin=a
return amin
print(task())
ZGVmIHRhc2soKToKCWFtaW49Tm9uZQoJd2hpbGUoVHJ1ZSk6CgkJc3RyX2lucD1pbnB1dCgpCgkJaWYgc3RyX2lucD09Ii4iIDogcmV0dXJuIGFtaW4KCQlhPWludChzdHJfaW5wKQoJCWlmIChhbWluPT1Ob25lKSBhbmQgKGEgPjApIDogYW1pbj1hCgkJaWYgKGEgPCBhbWluKSBhbmQgKGEgPiAwKSA6IGFtaW49YQoJcmV0dXJuIGFtaW4KCQpwcmludCh0YXNrKCkpCgoK