n = int(input())
lista = []
for i in range(n):
liczba = int(input())
lista.append(liczba)
maksi = lista[0]
for i in range(1, n):
if lista[i] > maksi:
maksi = lista[i]
print(maksi)
biA9IGludChpbnB1dCgpKQpsaXN0YSA9IFtdCmZvciBpIGluIHJhbmdlKG4pOgoJbGljemJhID0gaW50KGlucHV0KCkpCglsaXN0YS5hcHBlbmQobGljemJhKQoKbWFrc2kgPSBsaXN0YVswXQpmb3IgaSBpbiByYW5nZSgxLCBuKToKCWlmIGxpc3RhW2ldID4gbWFrc2k6CgkJbWFrc2kgPSBsaXN0YVtpXQpwcmludChtYWtzaSk=