Suhana and Horror House

Suhana is planning to adventure a horror house. She has the map of the horror house. It is a N x M rectangle. Entrance is (1, 1) and (N, M) is the exit. From each cell, she can go to any side-adjacent cell but the only exit is (N, M). At each cell, there is a Panic Factor PFi,j and Passing Time PTi,j. She aims to exit the with minimum sum of panic factor. But she found that there can be many