Untitled

#include<iostream> 
using namespace std;

int cal(int a,int b,int c,int d)
{
	int m,n,sum=0;
	m=a+b;
	n=c+d;
	while(m<n)
	{

		sum=sum+m;
		m++;
	}
	return sum-a+c;
}

int main() 
{
	int n,i;
	cin>>n;
	int a[500][4]={{0}};
	int b[500]={0};
	for(i=0;i<n;i++)
	{
		cin>>a[i][0]>>a[i][1]>>a[i][2]>>a[i][3];
		b[i]=cal(a[i][0],a[i][1]+1,a[i][2],a[i][3]+1);
	}
	for (i=0;i<n;i++)
	{
		cout<<"Case "<<i+1<<':'<<b[i]<<endl;
	}

	return 0;
}