A - A+...+B Problem
A - A+...+B Problem
N, A, B = list(map(int, input().split())) if N==1 and A != B: print(0) elif N==1 and A == B: print(1) elif A > B: print(0) else: num_min = (N-1)*A + B num_max = A + (N-1) * B print(num_max - num_min + 1)
N, A, B = list(map(int, input().split())) if N==1 and A != B: print(0) elif N==1 and A == B: print(1) elif A > B: print(0) else: num_min = (N-1)*A + B num_max = A + (N-1) * B print(num_max - num_min + 1)