三个非负整数a,b,c；
30% a <= 100, b <= 10^4, 1 <= c <= 100 60% a <=10^4, b <= 10^5, 1 <= c <= 10^4 100% a <=10^6, b <= 10^9, 1 <= c <= 10^6
7 2 5
4
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