python 3.0
n=int(input()) s=0 fn1=0 fn2=1 for i in range(1,n+1): if i==1: s=fn1 elif i==2: s=fn2 else: s=fn1+fn2 fn1=fn2 fn2=s print(s)
n=int(input()) s=0 fn1=0 fn2=1 for i in range(1,n+1): if i==1: s=fn1 elif i==2: s=fn2 else: s=fn1+fn2 fn1=fn2 fn2=s print(s)