1000-199+199-198+198-197+197-196+196-195+195-194+194-193+193-192+192-191+191-100=how many.
1000-199+199-198+198-197+197-196+196-195+195-194+194-193+193-192+192-191+191-100=多少．
<gadget id="calculator">1_000 - 199</gadget>
<output>801</output>

<gadget id="calculator">199 - 198</gadget>
<output>1</output>

<gadget id="calculator">198 - 197</gadget>
<output>1</output>

<gadget id="calculator">197 - 196</gadget>
<output>1</output>

<gadget id="calculator">196 - 195</gadget>
<output>1</output>

<gadget id="calculator">195 - 194</gadget>
<output>1</output>

<gadget id="calculator">194 - 193</gadget>
<output>1</output>

<gadget id="calculator">193 - 192</gadget>
<output>1</output>

<gadget id="calculator">192 - 191</gadget>
<output>1</output>

<gadget id="calculator">191 - 100</gadget>
<output>91</output>

<gadget id="calculator">801 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 91</gadget>
<output>900</output>

<result>900</result>