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Cod sursa(job #952748)
#include <cstdio>
FILE *f=fopen("inversmodular.in","r");
FILE *g=fopen("inversmodular.out","w");
long long mod;
long long phi(long long N)
{
int rez=0;
for(int i=2;i<N;i++)
if(N%i==0)rez++;
if(rez==0)
return N-2;
return rez;
}
long long invers(long long a,long long N)
{
long long x1=1,x2=a;
if(N==1)return a;
while(N>1)
if(N%2){x1=(x2*x1)%mod;N--;}
else {x2=(x2*x2)%mod;N/=2;}
return (x1*x2)%mod;
}
int main()
{
long long a,N,put;
fscanf(f,"%lld%lld",&a,&N);mod=N;
fprintf(g,"%lld",invers(a,N-2));
return 0;
}