#class GC():
#    def esc():
#        escGC += 0.125
#        if escGC >= 4:
#            escGC -= 4
#            escGCl[] = list.addint(escGCl[],1)

#  shell
def INIT_GC():
    global escGC
    escGC = 0.0
def esc():
    global escGC
    escGC += 0.125