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Cod sursa(job #295535)
#include<stdio.h>
long long a,b,s,c,i;
FILE*f=fopen("sumdiv.in","r");
FILE*g=fopen("sumdiv.out","w");
long long mod(long long a, long long b, long long c)
{if(b==1) return a%c;
else if(b%2==0) return (mod(a,b/2,c)*mod(a,b/2,c))%c;
else return (mod(a,b-1,c)*mod(a,1,c))%c;
}
int main()
{fscanf(f,"%lld %lld",&a,&b);
if(a==0) s=0;
else if(a==1||b==0) s=1;
else {s=(a+1)%9901;
for(i=2;i<=a/2;i++)
if(a%i==0) s=(s+i)%9901;
for(i=2;i<=b;i++)
s+=mod(a,i,9901)%9901;}
fprintf(g,"%lld",s);
fcloseall();
return 0;
}