1155.cpp

哈尔滨工业大学ACM 竞赛网上在线试题集锦的源代码

/*  This Code is Submitted by wywcgs for Problem 1155 on 2005-09-23 at 22:05:37 */ 
#include <stdio.h>

int main()
{
    long M, N, x;
    
    while(scanf("%ld %ld", &M, &N) == 2) {
        x = N - (M - 1) / 2;
        if(x >= 0) {
            printf("%ld\n", x);
        } else {
            printf("0\n");
        }        
    }
    
    return 0;    
}