# 計算1+2+....n

n = int(input('Please input N : '))
sum = 0
for i in range(1, n+1):
    sum = sum + i
print('1 + .. ',n , ' = ', sum)

# 方法2 用While迴圈

n = int(input('Please input N : '))
sum = 0
i = 1
while (i <= n):
    sum = sum + i
    i = i + 1

print('1 + .. ',n , ' = ', sum)


# 99乘法表
for i in range(2,10):
    for j in range(1,10):
        print('%2d x %2d = %2d ' % (i, j, i*j),end="")
    print()