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1sem/adaptation courses/5/17.cpp

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+// ac_5_17.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+#include <set>
+using namespace std;
+
+double df(int N) {
+    double out = 0.;
+    double i_ = 1;
+    for (int i = 1; i <= N; i++) {
+        i_ *= i;
+        double j_ = 1.;
+        double out_ = 1.;
+        for (int j = 1; j <= i; j++) {
+            j_ *= j;
+            out_ *= j_/i_;
+        }
+        out += out_;
+    }
+    return out;
+}
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    cout << "SP= " << df(N) << endl;
+}