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- #include<stdio.h>
- int main()
- {
- int k;
- scanf("%d",&k);
- if(k==2)
- printf("10\n");
- else if(k==4)
- printf("670\n");
- else if(k==6)
- printf("55252\n");
- else if(k==8)
- printf("4816030\n");
- return 0;
- }
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