#include<stdio.h> int main() { double num[11]={0}; double a = 2, b = 1, temp; int n; double ans = 0; for(int i = 0; i < 10; i++) { num[i] = a / b; temp = a; a += b; b = temp; } scanf("%d", &n); for(int i = 0; i < n; i++) ans += num[i]; printf("%.6f", ans); return 0; } |
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