#include<stdio.h> int main() { int n,i; int a[90]; a[0]=1; a[1]=2; while(scanf("%d",&n)!=EOF) { if(n==0) break; for(i=2;i<n;i++) { a[i]=a[i-1]+a[i-2]; } printf("%d\n",a[n-1]); } }
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