#include<stdio.h> int main() { int i,n,a[11]; double sum=0; scanf("%d",&n); a[0]=1;a[1]=2; for(i=2;i<n+1;i++) a[i]=a[i-1]+a[i-2]; for(i=0;i<n;i++) { sum+=(double)a[i+1]/a[i]; } printf("%.6lf",sum); }
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