\[\boxed{\mathbf{158.}}\]
\[100 + 50 = 150\]
\[50 + 100 = 150\]
\[500 + 20 = 520\]
\[20 + 500 = 520\]
\[200 + 5 = 205\]
\[5 + 200 = 205\]
\[400 + 3 = 403\]
\[3 + 400 = 403\]
\[300 + 24 = 324\]
\[24 + 300 = 324\]
\[600 + 12 = 612\]
\[12 + 600 = 612\]
\[700 + 46 = 746\]
\[46 + 700 = 746\]
\[800 + 53 = 853\]
\[53 + 800 = 853\]