This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<stdio.h>
int main(){
    int a,b;
    long long int gaji=1;
    scanf("%d %d",&a,&b);
    if(a%2) a++;
    if(b%2) b--;
    gaji=gaji*((b-a)/2+1);
    gaji=gaji*((a+b)/2);
    printf("%lld",gaji);
    return 0;
}
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