#include<stdio.h>
#include<math.h>
#include<string.h>
int main(void)
{
int n,m,i,sum,min;
m = 1;
for(i = 1;i>0;i++)
{
sum = sum + m;
m = m + 1;
if(sum >= n)
{
if(sum == n)
{
min = m - 1;
break;
}
else
{
min = m - 1;
break;
}
}
}
return 0;
}
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