1716. Calculate Money in Leetcode Bank

class Solution {
public:
    int totalMoney(int n) {

        int p=n/7;
        int sum=0;

        for(int i=1; i<=p; i++)
        {
           sum+=7*0.5*(i+i+6);
        }
        int r=n-p*7;
        sum+=r*0.5*(p+1+p+1+r-1);


       return sum; 
    }
};