Submission

Score: 10

User: phatto

Problemset: อนุกรม

Language: python

Time: 0.011 second

Submitted On: 2026-09-14 19:19:44

n=int(input())



F1 = 1
F2 = 1

#Fn = F n-1 + F n-2

if n == 1 or n == 2:
    print(1)
else:
    for _ in range(3, n+1):
        F1 = F2
        F2 = F1 + F2

    print(F2)