Dongdong threw stones into a pool. Throw l stones for the first time, 2 stones for the second time, 3 stones for the third time, 4 stones for the fourth time... The total number of stones he is going to throw into the pool is a multiple of 106. I would like to ask: How many times does Dongdong need to throw at least?
冬冬往一个水池里扔石子．第一次扔l颗石子，第二次扔2颗石子，第三次扔3颗石子，第四次扔4颗石子…他准备扔到水池的石子总数是106的倍数．请问：冬冬最少需要扔多少次？
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