代码

#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<vector>
#define RG register
using namespace std;
inline int read()
{
	int data=0, w=1;
	char ch=getchar();
	while(ch!='-'&&(ch<'0'||ch>'9')) ch=getchar();
	if(ch=='-') w=-1, ch=getchar();
	while(ch>='0'&&ch<='9') data=(data<<3)+(data<<1)+(ch^48), ch=getchar();
	return data * w;
}

long long a, b;

int main()
{
    a=read();
    b=read();
    printf("%lld\n", a*b-a-b);
    return 0;
}

评测结果