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