#include<stdio.h> int main() { long int a[90]={1,2,3}; int i; for(i=3;i<90;i++){ a[i]=a[i-1]+a[i-2]; } int m; while(scanf("%d",&m)!=EOF){ if(m==0){ break; } printf("%ld\n",a[m-1]); } }
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