ค้นหายอดเงินออมของบัญชีที่มียอดเช็คสูงสุด
Find the saving balance of the account with the highest checking balance.
df = pd.DataFrame({'name': ['John', 'Mary', 'Peter'], 'checking_balance': [100, 200, 300], 'savings_balance': [1000, 2000, 1500]})
df[df['checking_balance'] == df['checking_balance'].max()]['savings_balance']