View Compilation Error

0_0_35650825_8446.cpp: In function 'int main()':
0_0_35650825_8446.cpp:8:59: error: unable to find numeric literal operator 'operator""s'
    while(scanf("%d%d%d",&a,&b,&c)!=EOF&&a<1000&&b<1000&&c<1000s){
                                                           ^
0_0_35650825_8446.cpp:8:59: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes