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