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def sum(x,y,z):
i = 1
total = 0
while i < z:
total = total + x
x = x + 1
return total
m = int(input('请输入一个整数m,按回车键结束'))
n = int(input('请输入一个整数n,按回车键结束'))
k = int(input('请输入一个整数k,按回车键结束'))
print('最终的和是:',sum(m,n,k)