#include<iostream>
using namespace std;
void Fibonacci(int n)
{
if (n == 1 || n == 2)
{
cout << 1 << endl;
}
else
{
int *f1 = new int[1];
f1[0] = 1;
int lenf1=1;
int *f2 = new int[1];
f2[0] = 1;
int lenf2=1;
int *temp;
int count;
for (int i = 3; i <= n; i++)
{
int cn = 0;
int vw = 0;
count=lenf2+1;
temp=new int[count];
temp[0]=0;
int count1=count;
int num1=lenf1;
int num2=lenf2;
vw = f1[num1 - 1] + f2[num2 - 1] + cn;
cn = vw / 10;
temp[count1 - 1] = vw % 10;
count1--;
num1--;
num2--;
while (num2>=0)
{
if(num2==0&&num1==0&&cn!=0)
{
vw=cn;
temp[count1 - 1] = vw % 10;
count1--;
num2--;
}
else if(num2>0&&num1==0&&cn==0)
{
temp[count1 - 1] = f2[num2-1];
count1--;
num2--;
}
else if(num2>0&&num1==0&&cn!=0)
{
vw = f2[num2 - 1]+ cn;
cn = vw / 10;
temp[count1 - 1] = vw % 10;
count1--;
num2--;
}
else if(num2==0&&num1==0&&cn==0)
{
break;
}
else
{
vw = f1[num1 - 1] + f2[num2 - 1] + cn;
cn = vw / 10;
temp[count1 - 1] = vw % 10;
count1--;
num1--;
num2--;
}
}
f1 = new int[lenf2];
for (int j = 0; j < lenf2; j++)
{
f1[j] = f2[j];
}
if(temp[0]==0)
{
f2 = new int[count-1];
for (int k = 0; k <count-1; k++)
{
f2[k]=temp[k+1];
}
}
else
{
f2 = new int[count];
for (int k = 0; k <count ; k++)
{
f2[k] = temp[k];
}
}
lenf1=lenf2;
if(temp[0]==0)
{
lenf2=count-1;
}
else
{
lenf2=count;
}
}
if(temp[0]==0)
{
for(int j=1;j<count;j++)
{
cout<<temp[j];
}
}
else
{
for(int j=0;j<count;j++)
{
cout<<temp[j];
}
}
cout << endl;
delete []f1;
delete[]f2;
delete[]temp;
}
}
int main()
{
int n;
while(cin >> n)
{
Fibonacci(n);
}
return 0;
}
