#include <iostream> #include <cstdio> #include <queue> #include <algorithm> #include <cmath> #include <cstring> #define inf 2147483647 #define N 1000010 #define p(a) putchar(a) #define For(i,a,b) for(long long i=a;i<=b;++i) //by war //2019.8.7 using namespace std; long long a,b,p; void in(long long &x){ long long y=1;char c=getchar();x=0; while(c<'0'||c>'9'){if(c=='-')y=-1;c=getchar();} while(c<='9'&&c>='0'){ x=(x<<1)+(x<<3)+c-'0';c=getchar();} x*=y; } void o(long long x){ if(x<0){p('-');x=-x;} if(x>9)o(x/10); p(x%10+'0'); } long long msc(long long a,long long b){ long long r=0,y=1; if((a^b)<0) y*=-1; a=abs(a);b=abs(b); while(b>0){ if(b&1) r=(r+a)%p; a=(a<<1)%p; b>>=1; } return r*y; } signed main(){ in(a);in(b);in(p); o(msc(a,b)); return 0; }