# include <stdio.h>
int f[10];
int main()
{
int x,y,n,j;
while(~scanf("%d%d%d",&x,&y,&n))
{ f[1]=x;
f[2]=y;
for(j=3;j<=6;j++)
{
f[j]=f[j-1]-f[j-2];
}
n%=6;
if(n==0)
n=6;
if(f[n]>=0)
printf("%d\n",f[n]%1000000007);
else
while(f[n]<0)//注意负数取模 然后就没有然后了~~~~~
f[n]+=1000000007;
printf("%d\n",f[n]%1000000007);
}
return 0;
}

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