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#include<bits/stdc++.h>
using namespace std;
ifstream fin("nunta.in");
ofstream fout("nunta.out");
int n,a[1005],b[1005],c[1005];
int main()
{
fin>>n;
if(n<4) fout<<n;
else
{
n--;
a[0]=1,a[1]=1;
b[0]=1,b[1]=1;
while(n--)
{
int d;
for(d=1;d<=a[0] || d<=b[0];d++)
{
int t=c[d]+a[d]+b[d];
c[d]=t%10;
if(t>9) c[d+1]++;
}
if(c[d]!=0) c[0]=d;
else c[0]=d-1;
memcpy(a,b,sizeof b);
memcpy(b,c,sizeof c);
if(n==0) for(d=c[0];d>=1;d--) fout<<c[d];
for(d=c[0];d>=0;d--) c[d]=0;
}
}
return 0;
}