#include<cstdio>

#include<cmath>

#include<cstring>

const double pi = atan()*;

int poly[],Q[],n;

inline double calR(double x)

{

    double ans = poly[];

    for(int i = ; i <= n; i++ ){

        ans += poly[i]*pow(x,i);

    }

    return ans;

}

inline double calint(int x){

    double ans = ;

    for(int i = ,sz = n<<; i <= sz; i++ ){

        ans += Q[i]*pow(x,i+)/(i+);

    }

    return ans;

}

inline double calV(int a,int b){

    memset(Q,,sizeof(Q));

    for(int i = ; i <= n; i++){

        for(int j = ; j <= n; j++)

            Q[i+j] += poly[i]*poly[j];

    }

    return (calint(b)-calint(a))*pi;

}

inline double calS(double R,double theta,int slices){

    return R*sin(theta)/*R*slices;

}

int main()

{

    int T;

    scanf("%d",&T);

    int cas = ;

    while(T--){

        memset(poly,,sizeof(poly));

        scanf("%d",&n);

        for(int i = n; i >= ;i--)

            scanf("%d",poly+i);

        int a,b;

        scanf("%d%d",&a,&b);

        int slices,stacks;

        scanf("%d%d",&slices,&stacks);

        double dx = (b-a)*1.0/stacks, dtheta = *pi/slices;

        double R1 = calR(a),S1 = calS(R1,dtheta,slices);

        double x = a+dx;

        double ape = ;

        for(int i = ; i < stacks; i++){

            double R2 = calR(x);

            double S2 = calS(R2,dtheta,slices);

            double dS = dx/*(S1+S2+sqrt(S1*S2));

            ape += dS;

            x += dx;

            R1 = R2; S1 =S2;

        }

        double vol = calV(a,b);

        printf("Case %d: %.4lf\n",++cas,fabs(ape-vol)/vol*);

    }

    return ;

}