HDU 1284 钱币兑换问题

#include  
#define N 32769  
int main(){  
    int n,m;  
    while(scanf("%d",&n)!=EOF){  
        __int64 ans=(1+n/2);  
        __int64 w=n;  
        for(int j=1;j<=w/3;j++){  
            if(w-j*3>





0)ans++;  
            ans+=(w-j*3)/2;  
        }  
        if(w%3==0)ans++;  
        printf("%I64d\n",ans);  
    }  
    return 0;  
}