Im confused trying figure out if i buy stock based on PE mutiple approaches, assuming 20 times

Question: Do I buy stock?

5 * 20 = 100

100

or

Pe ratio:

23.83>20 = buy

Search for news or symbols WMT - Walmart Inc. NYSE- NYSE Delayed Price. Currency in USD 119.13 0.76 (-0.63%) At close: 4:00PM EST |Red Green Area Full screen 120.80 119.89 119.07 118.00 10 AM 12 PM 02 PM 04 PM 1D 5D 1M 6M YTD 1Y 5Y x Buy Sell Previous Close 119.89 Open 120.21 0.00 x 800 Bid Ask 119.00 x 1300 118.40 120.48 Day's Range 85.78 125.38 52 Week Range Volume 4,190,266 118.40 120.48 Day's Range 85.78 125.38 52 Week Range Volume 4,190,266 Avg. Volume 5,244,920 Market Cap 338.839B Beta (3Y Monthly) 0.41 PE Ratio (TTM) 23.83 EPS (TTM) 5.00 Earnings Date Feb 18, 2020 Forward Dividend & Yield 2.12 (1.77%) Ex-Dividend Date 2019-12-05 1y Target Est 129.03 Fidelity Related Video