500
201
1 2 odd
3 4 even
5 6 odd
7 8 even
9 10 odd
11 12 even
13 14 odd
15 16 even
17 18 odd
19 20 even
21 22 odd
23 24 even
25 26 odd
27 28 even
29 30 odd
31 32 even
33 34 odd
35 36 even
37 38 odd
39 40 even
41 42 odd
43 44 even
45 46 odd
47 48 even
49 50 odd
51 52 even
53 54 odd
55 56 even
57 58 odd
59 60 even
61 62 odd
63 64 even
65 66 odd
67 68 even
69 70 odd
71 72 even
73 74 odd
75 76 even
77 78 odd
79 80 even
81 82 odd
83 84 even
85 86 odd
87 88 even
89 90 odd
91 92 even
93 94 odd
95 96 even
97 98 odd
99 100 even
101 102 odd
103 104 even
105 106 odd
107 108 even
109 110 odd
111 112 even
113 114 odd
115 116 even
117 118 odd
119 120 even
121 122 odd
123 124 even
125 126 odd
127 128 even
129 130 odd
131 132 even
133 134 odd
135 136 even
137 138 odd
139 140 even
141 142 odd
143 144 even
145 146 odd
147 148 even
149 150 odd
151 152 even
153 154 odd
155 156 even
157 158 odd
159 160 even
161 162 odd
163 164 even
165 166 odd
167 168 even
169 170 odd
171 172 even
173 174 odd
175 176 even
177 178 odd
179 180 even
181 182 odd
183 184 even
185 186 odd
187 188 even
189 190 odd
191 192 even
193 194 odd
195 196 even
197 198 odd
199 200 even
201 202 odd
203 204 even
205 206 odd
207 208 even
209 210 odd
211 212 even
213 214 odd
215 216 even
217 218 odd
219 220 even
221 222 odd
223 224 even
225 226 odd
227 228 even
229 230 odd
231 232 even
233 234 odd
235 236 even
237 238 odd
239 240 even
241 242 odd
243 244 even
245 246 odd
247 248 even
249 250 odd
251 252 even
253 254 odd
255 256 even
257 258 odd
259 260 even
261 262 odd
263 264 even
265 266 odd
267 268 even
269 270 odd
271 272 even
273 274 odd
275 276 even
277 278 odd
279 280 even
281 282 odd
283 284 even
285 286 odd
287 288 even
289 290 odd
291 292 even
293 294 odd
295 296 even
297 298 odd
299 300 even
301 302 odd
303 304 even
305 306 odd
307 308 even
309 310 odd
311 312 even
313 314 odd
315 316 even
317 318 odd
319 320 even
321 322 odd
323 324 even
325 326 odd
327 328 even
329 330 odd
331 332 even
333 334 odd
335 336 even
337 338 odd
339 340 even
341 342 odd
343 344 even
345 346 odd
347 348 even
349 350 odd
351 352 even
353 354 odd
355 356 even
357 358 odd
359 360 even
361 362 odd
363 364 even
365 366 odd
367 368 even
369 370 odd
371 372 even
373 374 odd
375 376 even
377 378 odd
379 380 even
381 382 odd
383 384 even
385 386 odd
387 388 even
389 390 odd
391 392 even
393 394 odd
395 396 even
397 398 odd
399 400 even
1 400 odd