\[\boxed{\mathbf{371.}}\]
\[200 - 3 = 197\]
\[400 - 5 = 395\]
\[700 - 6 = 694\]
\[800 - 8 = 792\]
\[300 - 20 = 280\]
\[500 - 30 = 470\]
\[900 - 40 = 860\]
\[700 - 70 = 630\]
\[400 - 56 = 344\]
\[700 - 21 = 679\]
\[800 - 63 = 737\]
\[900 - 72 = 828\]
\[500 - 426 = 74\]
\[300 - 293 = 7\]
\[400 - 391 = 9\]
\[800 - 579 = 221\]