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: def fib(n):
    if n ==0 or n == 1:
        return 1
    l = [0] * (n+1)
    l[0] = 1
    l[1] = 1

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

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

Python: # -*- coding: utf-8 -*-
"""
Created on Fri May  4 20:13:10 2018
ALDS1_10_A
@author: maezawa
"""

fib_arr = [None for _ in range(45)]
fib_arr[1] = 1
fib_arr[2] = 1

def fib(n):
    if fib_arr[n] != None:
        return fib_arr[n]
    fib_arr[n] = fib(n-1)+fib(n-2)
    return fib_arr[n]
    
n = int(input())
print(fib(n))

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

Python: fib = [0 for i in range(45)]
fib[0] = 1
fib[1] = 1
for i in range(2, 45):
  fib[i] = fib[i - 1] + fib[i - 2]
a = int(input())
print(fib[a])

Python: 
fibo_list=[0 for i in range(48)]

def fibo(n):
    f=fibo_list[n]
    if f:
        return f
    else:
        if n==0 or n==1:
            return 1
        else:
            f=fibo(n-1)+(fibo(n-2))
    fibo_list[n]=f
    return f


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

Python: def fina(n, fina_list):

    if n <= 1:
        fina_list[n] = 1
        return fina_list[n]
    elif fina_list[n]:
        return fina_list[n]
    else:
        fina_list[n] = fina(n-1, fina_list) + fina(n-2, fina_list)
        return fina_list[n]


n = int(input())
fina_list = [None]*(n + 1)
print(fina(n, fina_list))

Python: n = int(input())


dps = [0 for _ in range(n + 1)]

dps[0] = 1
dps[1] = 1

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

print(dps[n])

Python: n=int(input())

a1=1
a=1

i=1
while i<n:
    a1,a=a,a1+a
    i+=1


print(a)

Python: 
f = [-1 for i in range(45)]
f[0] = f[1] = 1

def fib(n):
    global f
    for i in range(2,n+1):
        f[i] = f[i - 1] + f[i - 2]
        #print(i,f[i])
    return f[n]

if __name__ == "__main__":
    n = input("input number: ")
    n = int(n)
    #print(type(n))
    print(fib(n))

Python: def fib(n, a, b):
    if n == 0:
        return 0
    elif n == 1:
        return a
    else: return fib(n-1, a+b, a)

N = int(input())
a = fib(N, 1, 0)
print(a)

Python: # Aizu Problem ALDS_1_10_A: Fibonacci Number
#
import sys, math, os

# read input:
PYDEV = os.environ.get('PYDEV')
if PYDEV=="True":
    sys.stdin = open("sample-input.txt", "rt")


n = int(input())
if n < 2:
    print(1)
else:
    a, b = 1, 1
    for k in range(n - 1):
        a, b = b, a + b
    print(b)

Python: N = int(input())

memo = [-1]*500

def fibo(x):
    if memo[x] != -1:
        return memo[x]
    
    if x == 0 or x == 1:
        ans=1
        memo[x] = ans
        return ans
    
    ans = fibo(x-1) + fibo(x-2)
    memo[x] = ans
    return ans

print(fibo(N))

Python: a,b = 1,1
n = int(input())
for i in range(n):
	a,b = b,a+b


print(a)

Python: A=1
B=1
C=0 #２つ前の項
D=0 #1
N=int(input())
if N==0 or N==1:
    print(1)
elif N==2:
    print(2)

else:   
    C=B  #１
    D=A+B #2
    for i in range (N-3):
        B=C
        C=D
        D=B+C
    print(C+D)

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

Python: fib = [0 for i in range(45)]
fib[0] = 1
fib[1] = 1
for i in range(2, 45):
  fib[i] = fib[i - 1] + fib[i - 2]
n = int(input())
print(fib[n])

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

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

print(f[n])

Python: def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))

n = INT()

m = [-1] * (n+1)
m[0] = 1
m[1] = 1

def fib(n):
    if m[n] != -1:
        return m[n]
    
    ans = fib(n-1) + fib(n-2)
    m[n] = ans
    return ans

print(fib(n))

Python: n = int(input())

dp = [0] * 45
dp[0], dp[1] = 1, 1

for i in range(2, 44+1):
    dp[i] += dp[i-1] + dp[i-2]

print(dp[n])

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

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

Python: def Fibonacci(n):
    if n == 0 or n == 1:
        dic[n] = 1
    if n in dic.keys():
        return dic[n]
    dic[n] = Fibonacci(n-1) + Fibonacci(n-2)
    return dic[n]

a = int(input())
dic ={}
print(Fibonacci(a))

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

Python: def fb(num):
    a, b = 1, 0
    for _ in range(num):
        a, b = a + b, a
    return b

n = int(input())
print(fb(n+1))

Python: from functools import lru_cache

@lru_cache(maxsize=1024)

def fib(n):
    if n in [0, 1]:
        return 1
    return fib(n - 1) + fib(n - 2)

if __name__ == '__main__':
    print(fib(int(input())))