n=int(input())-1
M=998244353

def seki(a,b):
  c=[[0]*2,[0]*2]
  for i in range(2):
    for j in range(2):
      for k in range(2):
        c[i][j]+=a[i][k]*b[k][j]
        c[i][j]%=M
  return c

A=[[1,1],[1,0]]
B=[[1,0],[0,1]]
for i in range(60):
  if (n>>i)&1:
    B=seki(A,B)
  A=seki(A,A)

print((B[0][0]+B[1][0]-1)%M)