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Main1952.java
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Main1952.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main1952 {
public static void main(String[] args) throws NumberFormatException, IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int M = Integer.parseInt(st.nextToken());
int N = Integer.parseInt(st.nextToken());
int[] dx = {0,1,0,-1};
int[] dy = {1,0,-1,0};
int dir = 0;
boolean[][] visit =new boolean[M][N];
int cnt =0;
int x = 0,y=0;
while(true) {
if(visit[x][y]) {
break;
}
visit[x][y] =true;
x+=dx[dir];
y+=dy[dir];
if(x<0 || y<0 || x==M || y==N || visit[x][y]) {
x-=dx[dir];
y-=dy[dir];
dir=(dir+1)%4;
x+=dx[dir];
y+=dy[dir];
cnt++;
}
}
System.out.println(cnt-1);
}
}