d=int(input())
x=int(input())
y=int(input())
x1=0; y1=0; x2=d; y2=0; x3=0; y3=d;
k=(x1-x)*(y2-y1)-(x2-x1)*(y1-y);
m=(x2-x)*(y3-y2)-(x3-x2)*(y2-y);
n=(x3-x)*(y1-y3)-(x1-x3)*(y3-y);
if (k>=0 and m>=0 and n>=0):
    print (1)
else:
    print(0)