#include<stdio.h> int main() { int n, a, b; double k, s ,i, j; s = 0; i = 1; j = 2; scanf("%d", &n); for (a = 0; a < n; a++) { k = j / i; s = s + k; b = j; j = i + j; i = b; } printf("%.6lf", s); return 0; } |
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