\[\boxed{\mathbf{49.}}\]
\[30 + 2 = 32\]
\[32 - 2 = 30\]
\[32 - 30 = 2\]
\[40 + 6 = 46\]
\[46 - 6 = 40\]
\[46 - 40 = 6\]
\[50 + 7 = 57\]
\[57 - 7 = 50\]
\[57 - 50 = 7\]
\[60 + 1 = 61\]
\[61 - 1 = 60\]
\[61 - 60 = 1\]