uva 10060

多邊形的面積計算

//====================================================================||
//                                                                    ||
//                                                                    ||
//                         Author : GCA                               ||
//                  6AE7EE02212D47DAD26C32C0FE829006                  ||
//====================================================================||
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <climits>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <cctype>
#include <utility>
using namespace std;
#ifdef ONLINE_JUDGE
#define ll "%lld"
#else
#define ll "%I64d"
#endif
typedef unsigned int uint;
typedef long long int Int;
#define Set(a,s) memset(a,s,sizeof(a))
#define Write(w) freopen(w,"w",stdout)
#define Read(r) freopen(r,"r",stdin)
#define Pln() printf("\n")
#define I_de(x,n)for(int i=0;i<n;i++)printf("%d ",x[i]);Pln()
#define De(x)printf(#x"%d\n",x)
#define For(i,x)for(int i=0;i<x;i++)
#define CON(x,y) x##y
#define Pmz(dp,nx,ny)for(int hty=0;hty<ny;hty++){for(int htx=0;htx<nx;htx++){\
    printf("%d ",dp[htx][hty]);}Pln();}
#define M 55
#define PII pair<int,int>
#define PB push_back
#define oo INT_MAX
#define Set_oo 0x3f
#define Is_debug true
#define debug(...) if(Is_debug)printf("DEBUG: "),printf(__VA_ARGS__)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin();it!=(c).end();it++)
#define eps 1e-6
bool xdy(double x,double y){return x>y+eps;}
bool xddy(double x,double y){return x>y-eps;}
bool xcy(double x,double y){return x<y-eps;}
bool xcdy(double x,double y){return x<y+eps;}
int min3(int x,int y,int z){
    int tmp=min(x,y);
    return min(tmp,z);
}
int max3(int x,int y,int z){
    int tmp=max(x,y);
    return max(tmp,z);
}
int n;
double pi=acos(-1);
struct polys{
    double px[2000];
    double py[2000];
    double th;
    int pn;
    polys(){
        pn=0;
    }
}poly[20000];
char str[20000];
double cal(int a){
    double ans=0;
    for(int i=2;i<poly[a].pn;i++){
        double x=poly[a].px[i-1]-poly[a].px[0];
        double y=poly[a].py[i-1]-poly[a].py[0];
        double x2=poly[a].px[i]-poly[a].px[0];
        double y2=poly[a].py[i]-poly[a].py[0];
        ans+=(x*y2-x2*y);
//        debug("%lf\n",ans);
    }
    ans=fabs(ans);
    ans*=poly[a].th;
    ans/=2.00;
    return ans;
}
void clear(){
    for(int i=0;i<n;i++)poly[i].pn=0;
}
int main() {
    ios_base::sync_with_stdio(0);
    while(~scanf("%d%*c",&n)&&n){
        double r,th;
        for(int i=0;i<n;i++){
            gets(str);
            int j,t;
            sscanf(str,"%lf%n",&poly[i].th,&j);
            while(~sscanf(str+j,"%lf%lf%n",&poly[i].px[poly[i].pn],&poly[i].py[poly[i].pn],&t)){
//                debug("%lf %lf\n",poly[i].px[poly[i].pn],poly[i].py[poly[i].pn]);
                poly[i].pn++;
                j+=t;
            }
        }
        scanf("%lf%lf",&r,&th);
        double ans=0;
        for(int i=0;i<n;i++)ans+=cal(i);
//        debug("%lf %lf\n",ans,(r*r*pi*th));
        printf("%d\n",(int)(ans/(r*r*pi*th)));
        clear();
//        printf("ook");
    }

















}