int main()
{
while(~scanf("%d", &n))
{
readMatrix(a);
readMatrix(b);
readMatrix(c);
for(int i=0;i<n;++i)
x[i] = i;
mutiply(x, a, d);
mutiply(d, b, e);
mutiply(x, c, f);
if(equal(e, f))
printf("YES\n");
else
printf("NO\n");
}
return 0;
}
vec3& vec3::operator*=(const vec3& other)
{
return mutiply(other);
}
vec2& vec2::operator*=(const vec2& other)
{
return mutiply(other);
}
vec4& vec4::operator*=(const vec4& other)
{
return mutiply(other);
}
