#include <bits/stdc++.h>
#define LL long long
#define endl "\n"

using namespace std ;

//
template < typename T >

inline T read( T &x )
{

    x = 0 ;

    int f = 0 ;

    char ch = getchar() ;

    while( ch < '0' || ch > '9' )  {

        f |= ( ch == '-' ) , ch = getchar() ;

    }

    while( ch >= '0' && ch <= '9' )  {

        x = ( x << 1 ) + ( x << 3 ) + ch - '0' , ch = getchar() ;

    }

    return x = f ? -x:x ;

}
//

int sz ;

int lobo( int key , int female[] , int L , int R )
{

    int low = 0 , high = sz-1 , ans = -1 ;

    while( low <= high )  {

        int mid = low + (high-low)/2 ;

        if( female[mid]+key < L )  {

            low = mid+1 ;

        }

        else if( female[mid]+key >= L )  {

            if( female[mid]+key <= R )  {

                ans = mid ;

            }

            high = mid-1 ;

        }

    }

    return ans ;

}

int hibo( int key , int female[] , int L , int R )
{

    int ans = -1 , high = sz-1 , low = 0 ;

    while( low <= high )  {

        int mid = low + (high-low)/2 ;

        if( female[mid] + key > R )  {

            high = mid-1 ;

        }

        else  {

            low = mid+1 ;

            if( female[mid]+key >= L )  ans = mid ;

        }

    }

    return ans ;

}

void solve( void )
{

    int N , M ;

    cin >> N >> M ;

    int male[N] ;

    int fe[M] ;

    sz = M ;

    for( int i = 0 ; i < N ; i++ )  cin >> male[i] ;

    for( int i = 0 ; i < M ; i++ )  cin >> fe[i] ;

    int L , R ;

    cin >> L >> R ;

    sort( male , male+N ) ;

    sort( fe , fe + M ) ;

    int cnt = 0 ;

    for( int i = 0 ; i < N ; i++ )  {

        int x = lobo( male[i] , fe , L , R ) ;

        int y = hibo( male[i] , fe , L , R ) ;

        if( x == -1 || y == -1 )  continue ;

       // cout << "male: " << male[i] << "  x: " << x << "   y:  " << y << endl ;

        cnt += (y-x+1) ;

    }

    cout << cnt << endl ;

}

int main( void )

{

    //ios_base::sync_with_stdio( false ) ;  cin.tie( NULL ) ;  cout.tie( NULL ) ;

    #ifndef ONLINE_JUDGE
        freopen( "input.txt" , "r" , stdin ) ;
        freopen( "output.txt" , "w" , stdout ) ;
    #endif

    if( 0 )  {

        int t = 100 ;

        for( int i = 1 ; i <= t ; i++ )  solve() ;

    }

    else  {

        solve() ;

    }

    #ifndef ONLINE_JUDGE
        cout << "\nTime Elapsed: " << 1.0*clock()/CLOCKS_PER_SEC << " sec\n" ;
    #endif

    return 0 ;

}