5.1.19

#include <iostream>
#include <math.h>
using namespace std;

int main() {
    setlocale(LC_ALL, "Russian");
    int n, i;
    double S = 0.0, Ssin = 0.0;
    cout << "Введите значение n (n > 0): ";
    cin >> n;
    for (i = 1; i <= n; i++) {
        Ssin += sin(i);
        S += 1 / Ssin;
    }
    printf("S: %6.14lf", S);
    return 0;
}