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#include<bits/stdc++.h>
using namespace std;
int n;
char a[220],b[220];
int main()
{
freopen("nunta.in","r",stdin);
freopen("nunta.out","w",stdout);
scanf("%d",&n);
n++;
a[0]=1;
a[1]=1;
b[0]=1;
b[1]=1;
if(n==1 || n==2)
{
printf("1\n");
return 0;
}
for(int t1=3;t1<=n;t1++)
{
int t=0,i;
for(i=1;i<=a[0] || i<=b[0] || t;i++)
{
t=t+a[i]+b[i];
a[i]=t%10;
t/=10;
}
a[0]=i-1;
int m=max(a[0],b[0]);
for(int i=0;i<=m;i++)
{
swap(a[i],b[i]);
}
}
for(int i=b[0];i>=1;i--) printf("%d",b[i]);
printf("\n");
return 0;
}