Evaluate the similarity between them and classify them into classes from 0-5 as follows:
0 : The two sentences are completely dissimilar.
1 : The two sentences are not equivalent, but are on the same topic.
2 : The two sentences are not equivalent, but share some details.
3 : The two sentences are roughly equivalent, but some important information differs/missing.
4 : The two sentences are mostly equivalent, but some unimportant details differ.
5 : The two sentences are completely equivalent, as they mean the same thing.

Example Input: Sentence 1: That exploit works on unpatched Windows 2000 machines with Service Pack 3 and 4. Sentence 2: Both Counterpane and iDefense contend that the exploit works effectively against Windows 2000 systems running Service Pack 3 and 4.
Example Output: 3

Example Input: Sentence 1: elbaradei states that a middle east peace deal can only be reached in parallel with a security agreement based on eradicating all weapons of mass destruction from the region. Sentence 2: elbaradei was quoted as saying that a peace deal between israel and its arab neighbors must be reached in parallel with a security agreement based on eradicating all weapons of mass destruction from the region.
Example Output: 5

Example Input: Sentence 1: No argument with Jakarta on boats: Abbott Sentence 2: No agreement at Iran nuclear talks
Example Output:
0