c++ very easy part 5 polygon perimeter

  A polygon is with N sides. The program must accept the length of the N sides and print the perimeter P of the polygon as the output.

Input Format:
The first line denotes the value of N.
Next N lines contain the length of the N sides.

Output Format:
The first line contains the the perimeter P of the polygon

Boundary Conditions:
3 <= N <= 100
The length of the side is an integer value from 1 to 999999.

Example Input/Output 1:
Input:
3
100
60
70

Output:
230

Example Input/Output 2:
Input:
5
300
100
100
200
200

Output:
900

#include<bits/stdc++.h>

using namespace std;

int main()
{
    int a,sum=0;
    cin>>a;
for(int i=0;i<a;i++)
{
int b;
cin>>b;
sum+=b;
}
cout<<sum;

}