#include<stdio.h> int main() { int n,i; double a[10]={2/1.0,3/2.0,5/3.0,8/5.0,13/8.0,21/13.0,34/21.0,55/34.0,89/55.0,144/89.0},sum=0; scanf("%d",&n); for(i=0;i<n;i++) { sum=sum+a[i]; } printf("%.6f",sum); } |
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