[Error] expected nested-name-specifier before 'namespacestd'，这个是什么情况啊，出现好几次了，。大佬帮帮忙啊，谢谢了

#include

using namespacestd;

int equationCount(int n,int m);
{
if(n==1||m==1)
return 1;
else if(n<m)
return equationCount(n,n);
else if(n==m)
return 1+equationCount(n,n-1);
else
return equationCount(n,m-1)+equationCount(n-m,m);
}

int main(void)
{
    int n;
    while(scanf("%d",&n)!=EOF&&(n>=1&&n<=120))
    {
        printf("%d\n",equationCount(n,n));
    }
    return 0;
}

yi'shang'shi'wen'ti'dai'ma

没打空格using namespace std;