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#include<stdio.h> int main () { long long a,b,sum; scanf("%lld %lld",&a,&b); sum =(b * (b+1) - (a *(a-1)))/2; printf("%lld\n",sum); return 0; }
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#include<stdio.h> int main () { long long a,b,sum; scanf("%lld %lld",&a,&b); sum =(b * (b+1) - (a *(a-1)))/2; printf("%lld\n",sum); return 0; }