Go: package main

/*
フィボナッチ数列
*/

import (
	"bufio"
	"bytes"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
)

func fibWithMemo(n int, memo map[int]int) int {
	if n == 0 || n == 1 {
		return 1
	}
	if val, ok := memo[n]; ok {
		return val
	}
	memo[n] = fibWithMemo(n-1, memo) + fibWithMemo(n-2, memo)
	return memo[n]
}

func fib(n int) int {
	memo := make(map[int]int)
	return fibWithMemo(n, memo)
}

func main() {
	scanner := makeScanner(1024)
	n := eGetInt(scanner)
	fmt.Println(fib(n))
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

type ints []int

func (s ints) String() string {
	var buf bytes.Buffer
	buf.WriteString("[")
	sep := ""
	for _, v := range s {
		buf.WriteString(fmt.Sprintf("%s%d", sep, v))
		sep = ", "
	}
	buf.WriteString("]")
	return buf.String()
}

func reverse(a ints) ints {
	r := make(ints, len(a))
	for i := 0; i < len(a); i++ {
		r[i] = a[len(a)-1-i]
	}
	return r
}
func max(a ints) (int, bool) {
	if len(a) == 0 {
		return 0, false
	}
	m := a[0]
	for _, e := range a {
		if e > m {
			m = e
		}
	}
	return m, true
}
func min(a []int) int {
	m := a[0]
	for _, v := range a {
		if v < m {
			m = v
		}
	}
	return m
}

func sum(a ints) int {
	if len(a) == 0 {
		return 0
	}
	sum := 0
	for _, e := range a {
		sum += e
	}
	return sum
}
func find(n int, a ints) int {
	for i, v := range a {
		if n == v {
			return i
		}
	}
	return -1
}

Python: import sys

sys.setrecursionlimit(10 ** 7)
input = sys.stdin.readline
f_inf = float('inf')
mod = 10 ** 9 + 7


def resolve():
    n = int(input())
    fib = [0] * (n + 1)
    fib[0], fib[1] = 1, 1
    for i in range(2, n + 1):
        fib[i] = fib[i - 1] + fib[i - 2]
    print(fib[-1])


if __name__ == '__main__':
    resolve()

Python: n = int(input())
N =[1, 1, 2]
if n < 3:
    print(N[n])
else:
    i = 2
    while i < n:
        n0, n1, n2 = N
        N[2] = n1 + n2
        N[1] = n2
        N[0] = n1
        i += 1
    print(N[2])

Python: n = int(input())
fib = [0]*(n+1)

fib[0],fib[1] = 1, 1

for i in range(2, n+1):
    fib[i] = fib[i-1] + fib[i-2]
    
print(fib[n])

Python: n = int(input())
f = [0]*45

f[0] = f[1] = 1
for i in range(2, 45):
    f[i] = f[i-2] + f[i-1]

print(f[n])

Python: def fib(n):
  if n < 0:
    print("error")
    exit()
  if n < 2:
    return 1
  result = fib(n-1) + fib(n-2)
  return result

#n = int(input())
for n in range(44+1):
	print(fib(n))

Python: N=int(input())
D=[0]*(N+1)
D[0]=1
D[1]=1

for i in range(2,N+1):
    D[i]=D[i-1]+D[i-2]
print(D[N])

Python: n=int(input())
if n==0 or n==1:
    print(1)
else:
    a=[]
    a.append(1)
    a.append(1)
    for i in range(2,n+1):
        m=a[i-2]+a[i-1]
        a.append(m)
    print(m)

Python: 
n = int(input())
dp = [None] * (n+1)
dp[0] = 1
dp[1] = 1


def main():
    print(fib(n))


def fib(n):
    if n == 0 or n == 1:
        return 1
    elif dp[n] != None:
        return dp[n]
    else:
        dp[n] = fib(n-1) + fib(n-2)
        return dp[n]


if __name__ == "__main__":
    main()

Python: dp=[0]*50
dp[0]=1
dp[1]=1
N = int(input())

def makefib(n):
    if n == 0 or n == 1:
        return 1
    elif dp[n] == 0:
        dp[n] = makefib(n-1) + makefib(n-2)
        return dp[n]
    else:
        return dp[n]
print(makefib(N))

Python: x=int(input())
a=1
b=1
i=1
if x==0:
    print(1)
elif x==1:
    print(1)

else:
    while i<=x-1:
        c=a+b
        a=b
        b=c
        i+=1
    print(c)

Python: # coding: utf-8
# Your code here!

def fibo(n, memo = {}):
   if n == 0 or n == 1:
      return 1
   elif n in memo:
      return memo[n]
   else:
      memo[n] = fibo(n - 1, memo) + fibo(n - 2, memo)
      return memo[n]

n = int(input())
print(fibo(n))

Python: n = int(input())

dp = [0] * (n + 1)
dp[0] = 1
dp[1] = 1

for i in range(2, n + 1):
    dp[i] = dp[i - 1] + dp[i - 2]

ans = dp[n]
print(ans)

Python: n=int(input())
f=[0]*(n+1)
def fib(n,f):
	if n==0 or n==1:
		return 1
	else:
		if f[n]!=0:
			return f[n]
		else:
			f[n]=fib(n-1,f)+fib(n-2,f)
			return f[n]
print(fib(n,f))

Python: # -*- coding: utf-8 -*-

fib = [-1 for _ in range(50)]
fib[0] = 1
fib[1] = 2

for n in range(2, 50):
    fib[n] = fib[n - 1] + fib[n - 2]

N = int(input())
print(fib[N - 1])

Python: def makeFibonacci(n):
    F = [0] * (n+1)
    if n == 0:
        F[0] = 1
    else:
        F[0] = 1
        F[1] = 1
        for i in range(2, n+1):
            F[i] = F[i-2]+F[i-1]
    return F

n = int(input())
Ans = makeFibonacci(n)
print(Ans[n])

Python: n = int(input())
fib_b = [1,1]
if n > 1:
    for i in range(2,n+1):
        fib_b.append(fib_b[i-1]+fib_b[i-2])

print(fib_b[n])

Python: def fib(n):
    return 1 if n == 0 or n == 1 else fib(n - 1) + fib(n - 2)

print(fib(int(input())))

Python: n = int(input().strip())
if n == 0:
    print(1)
elif n == 1:
    print(1)
else:
    lst = [0 for i in range(0,n+1)]
    lst[0] = 1
    lst[1] = 1
    for i in range(0,n-1):
        lst[i+2] = lst[i+1] + lst[i]
    print(lst[n])

Python: n = int(input())
fib = [1, 1]
for i in range(2, n+1):
  fib.append(fib[i-1] + fib[i-2])
print(fib.pop())

Python: a=1
b=1
c=[]

n=int(input())
c.append(a)
c.append(b)
for i in range(n):
    c.append(a+b)
    d=b
    b+=a
    a=d
print(c[n])

Python: n = int(input())

dp = [0] * (n + 1)
dp[0] = 1
dp[1] = 1

for i in range(2, n + 1):
    dp[i] = dp[i - 1] + dp[i - 2]

print(dp[n])

Python: def makeFibonacci(n):
    if n <= 1:
        return str(1)
    F = [None]*(n+1)
    F[0] = 1
    F[1] = 1
    for i in range(2, n+1):
        F[i] = F[i-1] + F[i - 2]
    return str(F[n])

n = int(input())
print(makeFibonacci(n))

Python: n = int(input())
fib = [1]*(n+1)
for i in range(2,n+1): fib[i] = fib[i-1] + fib[i-2]
print(fib[n])

Python: n=int(input())
def Fib(n):
    a,b=0,1
    for i in range(n):
        a,b=b,a+b
    return b
print(Fib(n))

Python: #coding:UTF-8
def FN(n):
    if n==0 or n==1:
        return 1
    else:
        ans=FN(n-1)+FN(n-2)
        return ans
if __name__=="__main__":
    n=int(input())
    ans=FN(n)
    print(ans)

Python: F = {}

def fib(n):
  global F
  if n < 0:
    print("error")
    exit()
  if n < 2:
    F[n] = 1
    return F[n]
#  F[n] = fib(n-1) + fib(n-2)
  F[n] = F(n-1) + F(n-2)
  return F[n]

n = int(input())
print(fib(n))
#n = int(input())
#print(fib(n))
#fib(44)
#for i in range(5+1):
#  print(F[i])

Python: # Fibonacci Number

N = int(input())
dp = [-1] * (N+1)
dp[0] = 1
dp[1] = 1
for i in range(2, N+1):
    dp[i] = dp[i-2] + dp[i-1]
print(dp[-1])

Python: def fib(n):
    if n == 0 or n == 1:
        return 1
    else :
        return fib(n - 1) + fib(n - 2)


print( fib( int( input() ) ) )

Python: n = int(input())
fib = [0] * (n+1)
fib[0] = 1
fib[1] = 1
for i in range(2, n+1):
  fib[i] = fib[i-1] + fib[i-2]
print(fib[n])

Python: n=int(input())
dp=[0]*(n+1)
dp[0],dp[1]=1,1
for i in range(2,n+1):
    dp[i]=dp[i-1]+dp[i-2]
print(dp[n])