#include<stdio.h>
int main()
{
long s,d,i,n;
while(scanf("%ld%ld",&s,&d)==2)
{
n=0;
for(i=s;; ++i)
{
n+=i;
if(n>d || n==d)
{
printf("%ld\n",i);
break;
}
}
}
return 0;
}
int main()
{
long s,d,i,n;
while(scanf("%ld%ld",&s,&d)==2)
{
n=0;
for(i=s;; ++i)
{
n+=i;
if(n>d || n==d)
{
printf("%ld\n",i);
break;
}
}
}
return 0;
}
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