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#include <fstream>
using namespace std;
ifstream fin ("nunta.in");
ofstream fout ("nunta.out");
int n, i, d[3][10],j,t,maxim;
int main () {
fin>>n;
d[0][0]=d[0][1]=d[1][0]=1;
d[1][1]=2;
for (i=3;i<=n;i++){
maxim=d[0][0];
t=0;
if (d[1][0]>maxim)
maxim=d[1][0];
for (j=1;j<=maxim;j++) {
d[2][j]=d[0][j]+d[1][j]+t;
t=d[2][j]/10;
d[2][j]%=10;
}
d[2][0]=maxim;
if (t!=0)
d[2][++d[2][0]]=t;
for (j=0;j<=d[1][0];j++)
d[0][j]=d[1][j];
for (j=0;j<=d[2][0];j++)
d[1][j]=d[2][j];
}
for (i=d[2][0];i>=1;i--)
fout<<d[2][i];
return 0;
}