GA Q3

A series of natural numbers $F_1, F_2, F_3, F_4, F_5, F_6, F_7, \ldots$ obeys $F_{n+1}=F_n+F_{n-1}$ for all integers $n \geq 2$. If $F_6=37,$ and $F_7=60,$ then what is $F_1 ?$