#include<cstdlib>
#include<cstdio>
#include <algorithm>
using namespace std;
int main(){
    int n;
    scanf("%d", &n);
    int x1,y1,x2,y2;
    scanf("%d %d %d %d",&x1,&y1,&x2,&y2);
    int xL=x1, xP=x2, yG=y1, yD=y2;
    for(int i=0;i<n-1;++i){
        scanf("%d %d %d %d",&x1,&y1,&x2,&y2);
        xL=max(xL,x1);
        xP=min(xP,x2);
        yG=min(yG,y1);
        yD=max(yD,y2);
        if(xL>xP || yD>yG){
            printf("0");
            continue;
        }
        else {
            printf("%d",((xP-xL)*(yG-yD)));
        }
    }
}