a,b=map(float, input().split())
if a!=0:
m=-b/a
print(f"m:.1f")
else:
if b==0:
print("Vo_so_nghiem")
else:
print("Vo_nghiem")
YSxiPW1hcChmbG9hdCwgaW5wdXQoKS5zcGxpdCgpKQppZiBhIT0wOgogbT0tYi9hCiBwcmludChmIm06LjFmIikKZWxzZToKIGlmIGI9PTA6CiAgcHJpbnQoIlZvX3NvX25naGllbSIpCiBlbHNlOgogIHByaW50KCJWb19uZ2hpZW0iKQ==