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: She countersued for $125 million, saying Gruner & Jahr broke its contract with her by cutting her out of key editorial decisions. Sentence 2: She countersued for $125 million, saying G+J broke its contract with her by cutting her out of key editorial decisions and manipulated the magazine's financial figures.
Example Output: 4

Example Input: Sentence 1: A man is slicing cucumber with a knife. Sentence 2: A man is cooking a tortilla in a skillet.
Example Output: 1

Example Input: Sentence 1: the cfe is very important for european security. Sentence 2: the cfe is a cornerstone of european security.
Example Output:
5