n = int(input())
lista = []
for i in range(n):
lista.append(int(input()))
maxi = lista[0]
for i in range(1,n):
if lista[i] > maxi:
maxi = lista[i]
print(maxi)
biA9IGludChpbnB1dCgpKQpsaXN0YSA9IFtdCmZvciBpIGluIHJhbmdlKG4pOgoJbGlzdGEuYXBwZW5kKGludChpbnB1dCgpKSkKCm1heGkgPSBsaXN0YVswXQpmb3IgaSBpbiByYW5nZSgxLG4pOgoJaWYgbGlzdGFbaV0gPiBtYXhpOgoJCW1heGkgPSBsaXN0YVtpXQpwcmludChtYXhpKQ==