Creating many sumif statements

[vam4pe]

I've got two very long columns. The first column has a bunch of different numbers, the second column has an indicator of "1".
My goal is to create a new column that sums the values in column 1 every time the indicator from column 2 is 1.

I created a sample table of what this new column will look like below.

Can someone please help me!

0.1 0 0
0.5 1 0.6
0.9 0 0
0.7 1 1.6