#include<stdio.h> int main(){ int n; scanf("%d",&n); float up=2.0; float down=1.0; float t; float sum=0.0; for(int i=1;i<=n;i++){ sum+=1.0*up/down; t=up; up=up+down; down=t; } printf("%.2f",sum); return 0; } |
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