#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
int n,a,b,c,i;
a=1;
b=2;
scanf("%d",&n);
if(n==1)
printf("%d",a);
else if(n==2)
printf("%d",b);
else
{
for(i=3;i<=n;i++)
{
c=a+b;
a=b;
b=c;
}
printf("%d",c);
}
return 0;
}
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