Calculate average & percentage marks

#include<iostream>
using namespace std;
int main()
{
        int marks[5], i;
        float sum=0;
        cout<<"\n Enter Marks of Student \n";
        cout<<"\n Hindi : ";
        cin>>marks[0];
        cout<<"\n English : ";
        cin>>marks[1];
        cout<<"\n Maths : ";
        cin>>marks[2];
        cout<<"\n History : ";
        cin>>marks[3];
        cout<<"\n Science : ";
        cin>>marks[4];

        for(i=0;i<5;i++)
        {
                sum=sum+marks[i];
        }

        float avg=sum/5;
        float per;
        per=(sum/500)*100;
        cout<<"\n Average Marks = "<<avg;
        cout<<"\n Percentage = "<<per<<" %";
        return 0;
}