In the second week, she knitted 12 + 4 = <<12+4=16>>16 pairs of socks
In the first two weeks, she knitted 12 + 16 = <<12+16=28>>28 pairs of socks
On the third week, she knitted 28/2 = <<28/2=14>>14 pairs of socks
On the fourth week, she knitted 14 - 3 = <<14-3=11>>11 pairs of socks
Altogether, Laticia knitted 4 + 12 + 16 +14 + 11 = <<4+12+16+14+11=57>>57 pairs of socks
#### 57