数竞基础…整点…嗯
#include<cstdio>
int main(){
long long p,q;
scanf("%lld%lld",&p,&q);
if(p==q)printf("%lld",((p-1)/2)*((q+1)/2));
else printf("%lld",((p-1)/2)*((q-1)/2));
}
数竞基础…整点…嗯
#include<cstdio>
int main(){
long long p,q;
scanf("%lld%lld",&p,&q);
if(p==q)printf("%lld",((p-1)/2)*((q+1)/2));
else printf("%lld",((p-1)/2)*((q-1)/2));
}