Sum Quantites Against Given Criteria

here it a very simple sheet for me to explain what im trying to do

15
26
12
24
23
13
31

1 =10
2 =13
3 =1

ok i can manual add all the values in each box beside 1 and the same for 2 and the same for 3 but i'd like to write a formula that does this automatically within a range as the sheet is very large. so i need a formula that checks column A for 1 and for each time it sees that it adds the corresponding value beside it and the same for 2 and 3.