虱子多了不痒，债多了不愁

shī zi duō le bù yǎng , zhài duō le bù chóushiziduolebuyang,zhaiduolebuchou

1. (lit.) when covered with lice, one doesn't feel the itching anymore, and when up to one's ears in debt, one ceases to worry about it (saying)
2. (fig.) to be past worrying (about sth)

Study it in Yanamino