#include<stdio.h> int main() { int i,k,b,s,m; s=1; b=0; while(scanf("%d",&m)!=EOF&&m!=0) { for(i=0;i<m;i++) { k=b; b=b+s; s=k; } printf("%d\n",s+b); s=1; b=0; } return 0; }
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