Make 37

For Maths this week we have been making 37 with the numbers 1, 3, 5 and 7, 10 times. I tried 36 times to make 37, I have to say IT IS IMPOSSIBLE. Here is the problem. It's pretty hard, try it yourself. The easy part was finding ways to make 37. The hard part was finding the right way to make 37. 

Four bags contain a large number of 1's, 3's, 5's and 7's. Pick any ten numbers from the bag so that their total is 37.