#include <stdio.h> int main() { int n,a[20]={1,2}; double p,sum=0; int i; scanf("%d",&n); for(i=0;i<n;i++) { p=(double)a[i+1]/a[i]; sum=sum+p; a[i+2]=a[i]+a[i+1]; } printf("%.6f",sum); return 0; }
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