读入优化

#include<stdio.h>
using namespace std;

int read()
{
	char ch='.';
	int re=0;
	while (ch<'0'||ch>'9') ch=getchar();
	while (ch>='0'&&ch<='9')
	{
		re=re*10+ch-'0';
		ch=getchar();
	}
	return re;
}

int main()
{
	printf("%d",read());
	return 0;
}