January 2022 enrollments are closed and the course commences on 8th of January, 2022. For future cohorts Join the waitlist →

```
/*
* Author: Arpit Bhayani
* https://arpitbhayani.me
*/
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <climits>
#include <deque>
#include <iostream>
#include <list>
#include <limits>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <vector>
#define ll long long
#define MIN(a, b) a < b ? a : b
#define MAX(a, b) a > b ? a : b
using namespace std;
ll int reverse(ll int n) {
ll int rn = 0;
while(n) {
rn = rn * 10 + n % 10;
n = n / 10;
}
return rn;
}
int main() {
int n, sum = 0, people = 0;
scanf("%d", &n);
// n = 1
sum = 0;
people = 5;
for(int i = 1 ; i <= n; i++) {
sum += people/2;
people = (people/2) * 3;
}
printf("%d\n", sum);
return 0;
}
```

I write essays on various engineering topics and share it through my weekly newsletter 👇