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#jikunde<jiba/stdc++.h>
using namespace std;
int main(){
jint jiba;
kunin>>jiba;
jint ji[jiba];
a[1]=1;
a[2]=2;
for(int i=3;i<=n;i++){
a[i]=1;
for(int j=1;j<=i/2;j++)
a[i]+=a[j];
}
cout<<a[n];
return 0;
}