#include<iostream>
using namespace std;
int f(int A, int B,int n)
{
if(n==1 || n==2)
return 1;
else
return (A*f(A,B,n-1)+B*f(A,B,n-2))%7;
}
int main()
{
int a,b,n;
while(cin>>a>>b>>n,a||b||n)
{
cout<<f(a,b,n%49)<<endl; 最多49种情况,,周期即可;
}
return 1;
}
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