why my program isn't compiled?


#include<iostream>
#include<cmath>
using namespace std;

const double pi=3.1415926;
double x[101],y[101];
double dist(double x,double y)
{
    return sqrt(x*x+y*y);
}
int main()
{
    int n,i; double r,s,;
    cin>>n>>r;
    for (i=1; i<=n; i++) cin>>x[i]>>y[i];
    s=0; x[n+1]=x[1]; y[n+1]=y[1];
    for (i=1; i<=n; i++) s+=dist(x[i]-x[i+1],y[i]-y[i+1]);
    printf("%.2lf\n",s+2*pi*r);
}

int n,i; double r,s,; - delete "," after "s"