#include <stdio.h> #include <string.h> #include <stdlib.h> #include <limits.h> #include <math.h> double s[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}; int main() { int n; while (scanf("%d", &n) != EOF) { double sum = 0; for(int i = 0; i < n; i++) sum += s[i]; printf("%.6lf\n", sum); } } |
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