#include <stdio.h>
 
// 級数を計算する関数
double calculate_series(int n) {
    double sum = 0.0;
    for (int i = 1; i <= n; i++) {
        sum += 1.0 / (i * (i + 1));
    }
    return sum;
}
 
int main(void) {
    int n; // 入力する項数
    double result;
 
    // n の入力を受け取る
    printf("n を入力してください: ");
    scanf("%d", &n);
 
    // 級数の計算
    result = calculate_series(n);
 
    // 結果の出力
    printf("n = %d のときの x(n) の値: %.6f\n", n, result);
 
    return 0;
}

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