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#include<cstdio>
using namespace std;
int a[500],b[500],c[500];
int la,lb,lc,n;
int main()
{
freopen("nunta.in","r",stdin);
freopen("nunta.out","w",stdout);
scanf("%d",&n);
if(n==1)
printf("1");
else
if(n==2)
printf("2");
else
{
a[1]=1;
b[1]=2;
la=1;
lb=1;
for(int i=3;i<=n;++i){
for(int j=1;j<=lb;++j)
c[j]=a[j]+b[j];
lc=lb;
for(int j=1;j<=lc;++j)
if(c[j]>10)
{
c[j+1]++;
c[j]-=10;
if(j==lc)
++lc;
}
for(int j=1;j<=lb;++j)
a[j]=b[j];
la=lb;
for(int j=1;j<=lc;++j)
b[j]=c[j];
lb=lc;
}
for(int i=lc;i>=1;--i)
printf("%d",c[i]);
}
return 0;
}