#include <stdio.h> int main(){ int i; long a[100]; a[1]=1,a[2]=2; for(i=3;i<100;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]); } return 0; }
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