#include <iostream>
using namespace std;
inline int read(){
int ans=0;
char r=getchar();bool neg=false;
while(r<'0'||r>'9'){if(r=='-')neg=true;r=getchar();}
while(r>='0'&&r<='9'){ans=ans*10+r-'0';r=getchar();}
return (neg)?-ans:ans;
}
void write(int x){
if(x<0){putchar('-');x=-x;}
if(x>9)write(x/10);
putchar(x%10+'0');
}
int main()
{
cout << "Hello world!" << endl;
return 0;
}
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