#include <cstdio>#include <cstring>#include <iostream>#include <algorithm>using namespace std;int p,x,y,ai[27],ans;bool check(int xx){    if(xx<y) return false;    int i=(xx/50)%475;    for(int j=1;j<=25;j++)    {        i=(i*96+42)%475;        if(p==26+i) return true;    }    return false;}int main(){    scanf("%d%d%d",&p,&x,&y);    int pos=x;    while(pos>=y)    {        if(check(pos))        {            printf("0");            return 0;        }        pos-=50;    }    while(x<y) x+=100,ans++;    while(1)    {        if(check(x)||check(x-50))        {            printf("%d",ans);            return 0;        }        x+=100,ans++;    }    return 0;}