Решение задачи For 20

#include <bits/stdc++.h>
using namespace std;

int main() {
	srand((int)time(0));
	int N;
	N = rand() % 20 + 1;
	cout << "Number N: " << N << endl;
	
	double f = 1, s = 0;
	for(int i = 1; i <= N; i++) {
		f *= i;
		s += f;
		cout << i << " : "<< f << " : "<< s << endl;
	}
	cout << "Result: " << s << endl;
	return 0;
}

import random

N = random.randrange(1,10)
print('N = ', N)

F = 1.0
S = 0.0
for i in range(1,N+1):
    F *= i
    S += F
    print(i," : ", F," : ", S)
print("Result:",S)
									

program For20;
var
  Rez:Real;
  N, i :Integer;
begin
  Write('Введите N: ');
  Readln(N);
  Rez:=1;
  For i:=2  to N-1 do
   begin
    Rez:=Rez+Rez*i;
   end;
  Writeln(Rez);
end.