Ed found 7 shells + 2 shells + 4 shells = <<7+2+4=13>>13 shells at the beach.
Jacob found 13 shells + 2 shells = <<13+2=15>>15 shells at the beach.
In total Ed and Jacob have 2 shells + 13 shells + 15 shells = <<2+13+15=30>>30 shells.
#### 30