two people gave me the wrong answer. It's saying test 1, test 2 ,test is correct but test 4, test 5, and test 6 and test 7 is incorrect. it's missing something. Please help

Mary has an n m piece of paper that she wants to cut into 1 1 pieces according to the following rules: She can ny cut one piece of paper t ctine meaninig she crnot fldt aper at a time, meaning she cannot fold the paper or layer already-cut pieces on top of one another. . Each cut is a straight line from one side of the paper to the other side of the paper. For example, the diagram below depicts the three possible ways to cut a 3 x 2 piece of paper: A3 x 2 Paper Option 1 Option 2 Option 3 Given n and m, find and print the minimum number of cuts Mary must make to cut the paper into n m squares that are l x I unit in size