N=int(input())
suma = 0
for i in range (N):
x = float(input())
suma += x
wynik = suma / N
print(wynik)
Tj1pbnQoaW5wdXQoKSkKc3VtYSA9IDAKZm9yIGkgaW4gcmFuZ2UgKE4pOgogICAgICB4ID0gZmxvYXQoaW5wdXQoKSkKICAgICAgc3VtYSArPSB4Cnd5bmlrID0gc3VtYSAvIE4KcHJpbnQod3luaWsp