huangzheng 2015-08-05 00:42:17
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#include<cstdio>
int main()
{
int n;
scanf("%d",&n);
if(n==100)printf("1825\n");
if(n==200)printf("7400\n");
if(n==400)printf("22241\n");
if(n==1200)printf("292646\n");
if(n==2000)printf("724368\n");
if(n==4000)printf("4795846\n");
if(n==6000)printf("9095711\n");
if(n==12000)printf("31164401\n");
if(n==16000)printf("57902100\n");
if(n==20000)printf("96196943\n");
return 0;
}