#include<stdio.h> int main() { double a1,a2,m; int n; double sum=0; a1=2; a2=1; scanf("%d",&n); for(int i=1;i<=n;i++) { sum=sum+a1/a2; m=a1; a1=a1+a2; a2=m; } printf("%.6lf\n",sum); }
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