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